Report from the SMHI monitoring cruise with M/V Meri

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Martin Hansson Swedish Meteorological and Hydrological Institute Oceanographic Laboratory 1-3- Dnr: S/Gbg-1- Report from the SMHI monitoring cruise with M/V Meri Survey period: 1-3-1-1-3- Principal: Swedish Meteorological and Hydrological Institute (SMHI), Swedish Agency for Marine and Water Management (SwAM) Cooperation partners: Finnish Environment Institute (SYKE), VG-Shipping SUMMARY Due to the rough and cold weather and the resulting icing situation, the central parts of the Baltic Proper could not be visited. During the cruise, which is part of the Swedish pelagic monitoring programme, the Skagerrak, the Kattegat, the Sound, the Arkona Basin, the Bornholm Basin, the Hanö Bight and the Kalmarsund was visited. The spring bloom in the Skagerrak and the Kattegat was ongoing, which was noted with high fluorescence peaks noted from the CTD probe and low nutrient concentrations in the surface water. In the visited parts of the Baltic Proper there were still winter conditions. For more information on species composition see separate algae report "AlgAware". Nutrients in the form of dissolved inorganic nitrogen (DIN) and phosphorus (DIP) in the surface layer were generally at normal levels throughout the investigated area. The silicate concentrations in the southern Baltic Proper were still much higher than normal. In the bottom water of the Hanö Bight and the Bornholm Basin, oxygen levels were found close to ml/l. Acute oxygen deficiency (< ml/l) was found here from -7 meters deep. In the Skagerrak, oxygen concentrations were noted that were lower than normal. However, the concentrations in the deep water ranged between - ml/l which is above the limit of acute oxygen deficiency. In the Sound, low oxygen levels were also observed near the bottom, just under 3 ml/l. The next cruise is scheduled for mid April. Adress: Sven Källfelts Gata 1 71 Västra Frölunda Telefon: 11-9 E-post: johan.kronsell@smhi.se WWW: http://www.smhi.se/

RESULTS The March cruise was conducted on board the Finnish heavy load carrier M/S Meri and started in Gothenburg on March 1th and ended in the same port on March th. The winds were weak the first day but then increased to fresh or tough wind from the northeast. The air temperature fell in the Baltic Sea from just over to - C. The cruise was forced to make a day s stay in the Kalmarsund due to hard winds and minus degrees, which created ice formation on the ship. Icing warnings were issued for the central Baltic Proper and therefore it was not possible to visit the stations around Gotland. This report is based on data that have passed a first quality control. When data are published at the National Oceanographic Data Centre some values might have changed after further quality controls have been performed. Data from this cruise will be published as soon as possible on the data center s webpage, normally within a week after the cruise. Download data here: http://www.smhi.se/klimatdata/oceanografi/havsmiljodata (only available in Swedish). The Skagerrak After recent cold weather, the surface water temperature was below normal and varied around C. Below the cold surface water at the outer stations there was warmer water than usual for the season. The salinity in the surface was much lower than normal, about in the offshore areas and about at the coast and in the southern parts. The thermocline and halocline coincided at all stations, and was found at about 1 meters depth. The nutrients were influenced by the current spring bloom and were partially or almost completely consumed. The levels of dissolved inorganic nitrogen (DIN, sum of nitrate + nitrite + ammonium) were at normal levels in surface water throughout the area and varied around.3 -. µmol/l except at Å1 and at Släggö close to the coast where higher concentrations were noted, 3. and 1. µmol/l respectively. Dissolved inorganic phosphorus (DIP) showed normal levels around. -. µmol/l. The silicate content was normal for the season in the surface water with concentrations of about.9-3. µmol/l. The spring bloom were continuing at all stations in the Skagerrak and high fluorescence peaks were found at around -1 meters deep throughout the area. For more information on species composition and abundance see separate algae report: "AlgAware" https://www.smhi.se/publikationer/publikationer/algrapporter Oxygen levels were higher than normal in the surface water as a result of the current spring bloom, but lower than normal in the deep water. However, the oxygen concentrations in the deep water ranged between - ml/l, which is well above the limit of acute oxygen deficiency at ml/l. The Kattegat and the Sound The water temperature was lower than normal for the season and varied around - 1 C in the surface layer. The temperature increased with depth and in the deeper water mass it was - 7 C. Also, the salinity was lower than normal and varied in surface water between 17 and 1. In the Sound salinity ranged between 1 at the surface and up to 3 at the bottom. At all stations, the thermocline coincided with the halocline between 1 - meters depth.

Due to the ongoing spring bloom, the concentrations of nutrients DIN, DIP and silicate had now dropped and showed low levels, which is normal for this time of the year. The levels of DIN in the surface water now varied around.3 -.9 µmol/l and DIP around.1 -.3 µmol/l. The levels of DIN and DIP both increased with depth. The silicate concentration had also decreased as a result of spring bloom, but at Fladen concentrations much higher than normal were found;. µmol/l. In the Sound the nutrient levels were not affected by the spring bloom because the surface water here usually comes from the southern Baltic Sea where winter conditions still prevailed and spring bloom had not started. The levels of nutrients were here much higher than normal; DIN:. µmol/l, DIP:.7 µmol/l, silicate: µmol/l. The spring bloom in the Kattegat continued as observed with fluorescence measurements with the CTD probe. High concentrations of phytoplankton were noted at - meters deep. Extra phytoplankton samples were taken in these fluorescence maxima which will be analyzed and reported in the separate algae report "AlgAware". The deep water in the entire area was well oxygenated, which is normal for the season. The only exception was the bottom water in the Sound where very low oxygen levels were observed, just under 3 ml/l. The Arkona Basin, the Bornholm Basin, the Hanö Bight and the Kalmarsund Due to rough and cold weather and the resulting icing situation, the central parts of the Baltic Proper could not be visited. The areas that could be investigated were the Arkona and Bornholm Basin, the Hanö Bight and the Kalmarsund. The surface water temperature was normal throughout the surveyed area and varied around. -. C, and at the coastal stations in the Kalmarsund approximately.1 C. The salinity in the surface water varied between 7. -.. In the Kalmarsund the salinity was somewhat lower;.. The surface layer was cooled and well mixed and was divided from the deep water by a distinct thermocline and halocline that coincided throughout the area. The stratification was found in the Arkona Basin at meters and in the other areas around meters depth. The level of dissolved inorganic nitrogen (DIN) was normal for the season in the surface water and varied between. -.9 µmol/l. In the Kalmarsund the level was higher;. µmol/l. The concentration of phosphate (DIP) in the surface layer was at normal levels or slightly higher than normal and varied around.7 -. µmol/l. The silicate concentrations in the area were still much higher than normal. The levels had increased at most stations since the last visit in January/February. The concentrations varied just over 19 µmol/l, slightly higher, 1 µmol/l, at the coastal station in the Kalmarsund. In the bottom water in the Hanö Bight and the Bornholm Basin, oxygen levels were found close to ml/l. Acute oxygen deficiency (< ml/l) was found in the Bornholm Basin and in Hanö Bight from - 7 meters deep. In the Arkona Basin at BY, oxygen concentration dropped to about. ml/l at the bottom. Fluorescence measurements from CTD probe did not show any phytoplankton activity, no strong fluorescence peaks were found.

Figure 1. Map showing surface values of nitrate+nitrite (left) and phosphate (right) in µmol/l. Figure. Map showing surface values of silicate in µmol/l.

PARTICIPANTS Name From Martin Hansson Chief Scientist SMHI Örjan Bäck SMHI Sara Johansson SMHI Sari Sipilä SMHI Anna-Kerstin Thell SMHI APPENDICES - Track chart - Table over stations, sampled parameters and number of sampling depths - Map showing bottom oxygen concentrations - Vertical profiles for regular monitoring stations - Monthly average surface water plots for regular monitoring stations

F RR1 F9 RR RR7 BO3 F13 F1 F1 Sydostbrotten US Ulvödjupet US3 USB US7 MS MS F SR1A SR3 SR SS9 SR F Solovjeva F33 Grundkallen BY3 Tröskeln Ålands Hav LL1 BY7 LL17 LL1 BY /LL19 BY1 BY3/LL BY3 GF9 GF Blå Jungfrun Läsö ränna 9 Ålborg bugt L:a Middelgrund N1 Falkenberg Laholm-3 (YG) St Middelgrund RefM1V1 Kullen 9 Kattegatt SW BY39 Vågboj Knolls grund BY13 BY9 BY19 BY11 Hanöbukten Hanöbukten-KBV 1 Stevns klint BY3 Stolpe tröskel BY7 PL-P3 PL-P1

Date: 1--1 Time: 1:3 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Ship: 7V Year: 1 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Ser Cru Stat Proj Stat Lat Lon Start Start Bottom Secchi Wind Air Air WCWI CZPP No No T T S S P D D H P P N N N A N A S H C C no no code name date time depth depth dir vel temp pres elac hohp de btl e e a a h o o h t t t t m t l i u o o yyyymmdd hhmm m m C hpa aove loy m m l l x x s o o r r r o o k o m m m tueo apt p p t t y y s t i a z n t y 3 u n n hdsb o - s t t p b c b c b c s t t t t t t i v s l d l d l d i a s m i p t KAEX9 BAS... ANHOLT E.1 1. 131 1 1 9 1. 11 999 xx-- 1 x x x x x x x - x - x x x x - x x - x - 9 BPSH BAS... HANÖBUKTEN 37.7 1. 131 17 79 117 7 x--- 11 x x x x - x x - x - x x x x - - x - - x BPWK1 BAS... REF M1V1. 11.1 131 1 1-3 1 13 xx-- - x x x - x x - x - x x x x - x x - x x 1 BPWK EXT... ÖLAND ANKRING 1.9 1.79 1317 1 1 1 -.7 17 133 x--- - x - x - x x - x - x x x x - - x - - - BPSB7 BAS... BY BORNHOLMSDJ 1.3 1.9 131 1 9 13 1-1 1 999 x--- 1 x x x x x x x x x - x x x x - x x - x x 3 BPSB BAS... BY CHRISTIANSÖ.9 1. 131 3 9 13-1 1 13 x--- 1 x x x x - x x x x - x x x x - - x - - x BPSA3 BAS... BY ARKONA. 1.9 131 11 9 1-1 1 1 xx-- x x x x - x x - x - x x x x - - x - - x BPSA BAS... BY1.93 131.3 131 1 7 1 13 11 x--- x x x x - x x - x - x x x x - - x - - x SOCX39 BAS... W LANDSKRONA 1.99 1.7 131 3 99 3-1 13 9999 x--- 9 x x x x - x x - x - x x x x - - x - - - 7 KAEX9 BAS... ANHOLT E.1 1.7 1319 3-1 1 11 xx-- 1 x x x x x x x - x - x x x x - x x - x - KANX BAS... N1 FALKENBERG.39 11.71 1319 73 31 1 11 113 xx-- 7 x x x x x x x - x - x x x x - x x - x - 9 KANX BAS... FLADEN 711.7 1139.1 1319 1 1 1 11 3 x--- 1 x x x x x x x - x - x x x x - x x - x - 7 SKEX3 BAS... P 71.99 1117. 1319 13 93 1 73 x--- 1 x x x x - x x - x - x x x x - - x - x - 71 FIBG7 BAS... SLÄGGÖ 1. 11.13 1319 193 11 999 xx-- 9 x x x x - x x - x - x x x x - - x - x - 7 SKEX1 BAS... Å13.3 111.7 1319 1 3 1 1 11 999 x--- 1 x x x x - x x - x - x x x x - - x - x - 73 SKEX1 BAS... Å1 1.9 1. 1319 3 11 3 11 9999 ---- 11 - x - x - - x - - - - - - - - - - - - - 7 SKEX1 BAS... Å1 17. 1.71 13 3 13 3. 11 9999 x--- 1 x x x x - x x - x - x x x x - - x - x - 7 SKEX17 BAS... Å1 1.1 13. 13 3 13 11 9999 ---- 1 - x - x - - x - - - - - - - - - - - - - 7 SKEX1 BAS... Å17 17. 13. 13 33 33 3 1 117 9999 x--- 1 x x - x x x x - x - x x x x - x x - x x

N 7 N N N.9.9.9.3...71.3.93.3. 9.77 nan.3.1.1 9 7 3 1 ml/l 9 E 11 E 13 E 1 E 17 E

STATION ANHOLT E SURFACE WATER (-1 m) Annual Cycles 1 1 Mean 1-1 St.Dev. 1 3 1 1 1 3 7 9 1 11 1 1 3 7 9 1 11 1 3. PO mol/l 1. 1 1. 1.. 1 3 7 9 1 11 1 1 3 7 9 1 11 1 1 1 O saturation % 1 1 1 7 1 3 7 9 1 11 1 1 3 7 9 1 11 1 1 OXYGEN IN BOTTOM WATER (depth >= m) O ml/l O ml/l 1 1 3 7 9 1 11 1 Month 19 199 199 1 1 Year

Vertical profiles ANHOLT E March Mean 1-1 St.Dev. 1-3-1 Oxygen ml/l 1 1 1 3 3 3 1 1 1 3 1 PO mol/l 1 1 1 3 3 3.. 1. 1 1 1 1

STATION HANÖBUKTEN SURFACE WATER (-1 m) Annual Cycles 1 1 Mean 1-1 St.Dev. 1 1 9 7 1 3 7 9 1 11 1 1 3 7 9 1 11 1. PO mol/l 1. 1 1. 1.. 1 3 7 9 1 11 1 1 3 7 9 1 11 1 3 1 O saturation % 1 1 1 1 7 1 3 7 9 1 11 1 1 3 7 9 1 11 1 OXYGEN IN BOTTOM WATER (depth >= 7 m) O ml/l O ml/l 1 3 7 9 1 11 1 Month 19 199 199 1 1 Year

Vertical profiles HANÖBUKTEN March Mean 1-1 St.Dev. 1-3-1 Oxygen ml/l 1 1 1 3 3 3 7 7 7 1 1 1 1 1 PO mol/l 1 1 1 3 3 3 7 7 7 1 3 1 1

STATION REF M1V1 SURFACE WATER (-1 m) Annual Cycles 1 1 Mean 1-1 St.Dev. 1 1 9 7 1 3 7 9 1 11 1 1 3 7 9 1 11 1. PO mol/l 3 1. 1. 1. 1. 1 3 7 9 1 11 1 1 3 7 9 1 11 1 3 1 O saturation % 1 1 1 1 7 1 3 7 9 1 11 1 1 3 7 9 1 11 1 1 OXYGEN IN BOTTOM WATER (depth >= 17 m) O ml/l O ml/l 1 1 3 7 9 1 11 1 Month 19 199 199 1 1 Year

Vertical profiles REF M1V1 March Mean 1-1 St.Dev. 1-3-1 Oxygen ml/l 1 1 1 1 1 1 1 1 1 1 PO mol/l 1 1 1 1 1 1.. 1. 1 1 1

STATION BY BORNHOLMSDJ SURFACE WATER (-1 m) Annual Cycles 1 1 Mean 1-1 St.Dev. 1 1 9 7 1 3 7 9 1 11 1 1 3 7 9 1 11 1. PO mol/l 1. 1 1. 1.. 1 3 7 9 1 11 1 1 3 7 9 1 11 1 3 1 O saturation % 1 1 1 1 7 1 3 7 9 1 11 1 1 3 7 9 1 11 1 1 OXYGEN IN BOTTOM WATER (depth >= m) O ml/l O ml/l 1 3 7 9 1 11 1 Month 1 19 199 199 1 1 Year

Vertical profiles BY BORNHOLMSDJ March Mean 1-1 St.Dev. 1-3-1 Oxygen ml/l 1 1 1 3 3 3 7 7 7 1 1 1 3 1 PO mol/l 1 1 1 3 3 3 7 7 7 1 1

STATION BY CHRISTIANSÖ SURFACE WATER (-1 m) Annual Cycles 1 1 Mean 1-1 St.Dev. 1 1 9 7 1 3 7 9 1 11 1 1 3 7 9 1 11 1. PO mol/l 1. 1 1. 1.. 1 3 7 9 1 11 1 1 3 7 9 1 11 1 3 1 O saturation % 1 1 1 1 7 1 3 7 9 1 11 1 1 3 7 9 1 11 1 1 OXYGEN IN BOTTOM WATER (depth >= m) O ml/l O ml/l 1 3 7 9 1 11 1 Month 1 19 199 199 1 1 Year

Vertical profiles BY CHRISTIANSÖ March Mean 1-1 St.Dev. 1-3-1 Oxygen ml/l 1 1 1 3 3 3 7 7 7 1 1 1 1 1 PO mol/l 1 1 1 3 3 3 7 7 7 1 1

STATION BY ARKONA SURFACE WATER (-1 m) Annual Cycles 1 1 Mean 1-1 St.Dev. 1 1 9 7 1 3 7 9 1 11 1 1 3 7 9 1 11 1. PO mol/l 1. 1 1. 1.. 1 3 7 9 1 11 1 1 3 7 9 1 11 1 3 1 O saturation % 1 1 1 1 7 1 3 7 9 1 11 1 1 3 7 9 1 11 1 1 OXYGEN IN BOTTOM WATER (depth >= m) O ml/l O ml/l 1 1 3 7 9 1 11 1 Month 19 199 199 1 1 Year

Vertical profiles BY ARKONA March Mean 1-1 St.Dev. 1-3-1 Oxygen ml/l 1 1 1 1 1 1 3 3 3 3 3 3 1 1 1 1 1 PO mol/l 1 1 1 1 1 1 3 3 3 3 3 3.. 1. 1.. 1 1

STATION BY1 SURFACE WATER (-1 m) Annual Cycles 1 1 Mean 1-1 St.Dev. 1 1 9 7 1 3 7 9 1 11 1 1 3 7 9 1 11 1. PO mol/l 1. 1 1. 1.. 1 3 7 9 1 11 1 1 3 7 9 1 11 1 3 1 O saturation % 1 1 1 1 7 1 3 7 9 1 11 1 1 3 7 9 1 11 1 1 OXYGEN IN BOTTOM WATER (depth >= m) O ml/l O ml/l 1 1 3 7 9 1 11 1 Month 19 199 199 1 1 Year

Vertical profiles BY1 March Mean 1-1 St.Dev. 1-3-1 Oxygen ml/l 1 1 1 1 1 1 3 3 3 3 3 3 1 1 1 1 1 PO mol/l 1 1 1 1 1 1 3 3 3 3 3 3.. 1. 1 1 1

STATION W LANDSKRONA SURFACE WATER (-1 m) Annual Cycles 1 1 Mean 1-1 St.Dev. 1 1 1 1 3 7 9 1 11 1 1 3 7 9 1 11 1. PO mol/l 1. 1 1. 1.. 1 3 7 9 1 11 1 1 3 7 9 1 11 1 3 1 O saturation % 1 1 1 1 7 1 3 7 9 1 11 1 1 3 7 9 1 11 1 1 OXYGEN IN BOTTOM WATER (depth >= m) O ml/l O ml/l 1 1 3 7 9 1 11 1 Month 19 199 199 1 1 Year

Vertical profiles W LANDSKRONA March Mean 1-1 St.Dev. 1-3-1 Oxygen ml/l 1 1 1 3 3 3 1 1 1 3 1 PO mol/l 1 1 1 3 3 3.. 1. 1.. 1 1 1 3

STATION ANHOLT E SURFACE WATER (-1 m) Annual Cycles 1 1 Mean 1-1 St.Dev. 1 3 1 1 1 3 7 9 1 11 1 1 3 7 9 1 11 1 3. PO mol/l 1. 1 1. 1.. 1 3 7 9 1 11 1 1 3 7 9 1 11 1 1 1 O saturation % 1 1 1 7 1 3 7 9 1 11 1 1 3 7 9 1 11 1 1 OXYGEN IN BOTTOM WATER (depth >= m) O ml/l O ml/l 1 1 3 7 9 1 11 1 Month 19 199 199 1 1 Year

Vertical profiles ANHOLT E March Mean 1-1 St.Dev. 1-3-19 Oxygen ml/l 1 1 1 3 3 3 1 1 1 3 1 PO mol/l 1 1 1 3 3 3.. 1. 1 1 1 1

STATION N1 FALKENBERG SURFACE WATER (-1 m) Annual Cycles 1 1 Mean 1-1 St.Dev. 1 3 1 1 1 3 7 9 1 11 1 1 3 7 9 1 11 1 3. PO mol/l 3 1. 1. 1. 1. 1 3 7 9 1 11 1 1 3 7 9 1 11 1 3 1 O saturation % 1 1 1 1 7 1 3 7 9 1 11 1 1 3 7 9 1 11 1 1 OXYGEN IN BOTTOM WATER (depth >= m) O ml/l O ml/l 1 1 3 7 9 1 11 1 Month 19 199 199 1 1 Year

Vertical profiles N1 FALKENBERG March Mean 1-1 St.Dev. 1-3-19 Oxygen ml/l 1 1 1 1 1 1 3 1 1 3 1 3 3 1 PO mol/l 1 1 1 1 1 1 3..... 1. 3 1 1 3 1 1

STATION FLADEN SURFACE WATER (-1 m) Annual Cycles 1 1 Mean 1-1 St.Dev. 1 3 1 1 1 3 7 9 1 11 1 1 3 7 9 1 11 1 3. PO mol/l 3 1. 1. 1. 1. 1 3 7 9 1 11 1 1 3 7 9 1 11 1 1 1 O saturation % 1 1 1 7 1 3 7 9 1 11 1 1 3 7 9 1 11 1 1 OXYGEN IN BOTTOM WATER (depth >= 7 m) O ml/l O ml/l 1 1 3 7 9 1 11 1 Month 19 199 199 1 1 Year

Vertical profiles FLADEN March Mean 1-1 St.Dev. 1-3-19 Oxygen ml/l 1 1 1 3 3 3 7 7 7 1 1 1 3 1 PO mol/l 1 1 1 3 3 3 7 7 7.. 1. 1.. 1 1 1 1

STATION P SURFACE WATER (-1 m) Annual Cycles 1 1 Mean 1-1 St.Dev. 1 3 1 1 1 3 7 9 1 11 1 1 3 7 9 1 11 1 3. PO mol/l 3 1. 1. 1. 1. 1 3 7 9 1 11 1 1 3 7 9 1 11 1 1 1 O saturation % 1 1 1 7 1 3 7 9 1 11 1 1 3 7 9 1 11 1 1 OXYGEN IN BOTTOM WATER (depth >= 7 m) O ml/l O ml/l 1 1 3 7 9 1 11 1 Month 19 199 199 1 1 Year

Vertical profiles P March Mean 1-1 St.Dev. 1-3-19 Oxygen ml/l 1 1 1 3 1 PO mol/l.. 1. 1.. 1 1 1 1

STATION SLÄGGÖ SURFACE WATER (-1 m) Annual Cycles 1 1 Mean 1-1 St.Dev. 1 3 1 1 1 3 7 9 1 11 1 1 3 7 9 1 11 1 3. PO mol/l 3 1. 1. 1. 1. 1 3 7 9 1 11 1 1 3 7 9 1 11 1 3 1 O saturation % 1 1 1 1 7 1 3 7 9 1 11 1 1 3 7 9 1 11 1 1 OXYGEN IN BOTTOM WATER (depth >= m) O ml/l O ml/l 1 1 3 7 9 1 11 1 Month 19 199 199 1 1 Year

Vertical profiles SLÄGGÖ March Mean 1-1 St.Dev. 1-3-19 Oxygen ml/l 1 1 1 3 3 3 1 1 3 1 PO mol/l 1 1 1 3 3 3.. 1. 1 1 1 1

STATION Å13 SURFACE WATER (-1 m) Annual Cycles 1 1 Mean 1-1 St.Dev. 1 3 1 1 1 3 7 9 1 11 1 1 3 7 9 1 11 1 3. PO mol/l 1. 1 1. 1.. 1 3 7 9 1 11 1 1 3 7 9 1 11 1 1 O saturation % 1 1 1 1 7 1 3 7 9 1 11 1 1 3 7 9 1 11 1 1 OXYGEN IN BOTTOM WATER (depth >= m) O ml/l O ml/l 1 1 3 7 9 1 11 1 Month 19 199 199 1 1 Year

Vertical profiles Å13 March Mean 1-1 St.Dev. 1-3-19 Oxygen ml/l 1 1 1 1 3 1 1 PO mol/l 1..... 1. 1 1 1 1 1

STATION Å1 SURFACE WATER (-1 m) Annual Cycles 1 1 Mean 1-1 St.Dev. 1 3 1 1 1 3 7 9 1 11 1 1 3 7 9 1 11 1 3. PO mol/l 1. 1 1. 1.. 1 3 7 9 1 11 1 1 3 7 9 1 11 1 1 O saturation % 1 1 1 1 7 1 3 7 9 1 11 1 1 3 7 9 1 11 1 1 OXYGEN IN BOTTOM WATER (depth >= 1 m) O ml/l O ml/l 1 1 3 7 9 1 11 1 Month 19 199 199 1 1 Year

Vertical profiles Å1 March Mean 1-1 St.Dev. 1-3- Oxygen ml/l 1 1 1 1 1 1 1 1 3 1 PO mol/l 1 1 1 1 1 1..... 1. 1 1 1

STATION Å17 SURFACE WATER (-1 m) Annual Cycles 1 1 Mean 1-1 St.Dev. 1 3 1 1 1 3 7 9 1 11 1 1 3 7 9 1 11 1 3. PO mol/l 1. 1 1. 1.. 1 3 7 9 1 11 1 1 3 7 9 1 11 1 1 O saturation % 1 1 1 1 7 1 3 7 9 1 11 1 1 3 7 9 1 11 1 1 OXYGEN IN BOTTOM WATER (depth >= 3 m) O ml/l O ml/l 1 1 3 7 9 1 11 1 Month 19 199 199 1 1 Year

Vertical profiles Å17 March Mean 1-1 St.Dev. 1-3- Oxygen ml/l 1 1 1 1 1 1 3 3 3 1 1 1 3 1 PO mol/l 1 1 1 1 1 1 3 3 3.. 1. 1 1 1

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