Data collection, databases and ongoing monitoring programme

Transcription

1 HELSINKI COMMISSION HELCOM MORS-PRO 13/28 Project Group for Monitoring of Radioactive Substances in the Baltic Sea (MORS) 13 th Meeting St. Petersburg, Russia, May 28 Agenda Item 4 Data collection, databases and ongoing monitoring programme Document code: 4/4 Date: Submitted by: Consultant, SYKE STATUS OF THE MORS ENVIRONMENTAL DATABASE This document contains the basic graphs of data verification of of the MORS environmental data, compiled by the Consultant, SYKE. The Meeting is invited to comment and take note of the information. Note by Secretariat: FOR REASONS OF ECONOMY, THE DELEGATES ARE KINDLY REQUESTED TO BRING THEIR OWN COPIES OF THE DOCUMENTS TO THE MEETING

2 CALCULATION PRINCIPLES OF THE ENVIRONMENTAL DATA BIOTA Concentrations of 137 Cs and 9 Sr in fish muscle have been reported on herring, cod, and plaice and flounder data of as wet weight values of fish muscle. If any dry weight concentrations were reported they have been converted to wet weight values. As a result average concentrations and uncertainties have been calculated for each species (plaice and flounder together), for both nuclides and by basin and year. Two different tissue types of herring muscle have been reported separately. Concentrations in herring have been analyzed for filets (flesh without bones) and whole fish (without head and entrails). Concentrations in cod, and flounder and plaice muscle have been reported only on filets. Plaice and flounder have been considered as one species in the results. Wet weight values of 137 Cs in Fucus vesiculosus, have been converted to dry weight values, and thus dry weight concentrations have been used in calculations. Average concentrations of 137 Cs have been calculated by basin and by year. All values below the limit of detection (LOD) have been omitted from the calculations. Mean and combined uncertainty has been calculated as corrected averages and added in the graphs as error bars. Calculation method (ISO GUM based NIST method) and procedure was introduced in the MORS-PRO 11 meeting in 26. The method for calculating uncertainty is still under development. SEAWATER For seawater 137 Cs, 9 Sr and 239,24 Pu concentrations of have been reported. The results have been reported separately for surface and bottom waters. The following depth criteria have been used: For bottom water 1) Sampling depth > 1m; or 2) 1m < sampling depth 1m and the difference between the total depth and sampling depth 1 m. The average concentrations of nuclides have been calculated by year and by basin. For surface water the sampling depth 1m The average concentrations nuclides in surface water have been calculated by year and by basin. All values below the limit of detection (LOD) have been omitted from the calculations. If LOD values have been reported in certain year and basin, the years have been indicated as asterisks. Similar calculation method of mean and uncertainty as for biota has been used, but is still to be further developed. SEDIMENT Concentrations of two nuclides 4 K and 137 Cs have been analyzed of the reported sediment data of Average concentrations, Bq/kg, have been calculated for the following stations: CVI EB1 LL3a TEILI1 BY15 P5 P1 STOLGR FBELT1 65º14,16 N, 23º33,6 E in the Bothnian Bay 61º4, N, 19º44, E in the Bothnian Sea 6º4,4 N, 26º2,5 E in the Gulf of Finland 59º26, N, 21º29,8 E in the Northern Baltic Proper 57º19,2 N, 2º3, E in the Baltic Proper 55º15, N, 15º59, E in the Bornholm Sea 54º5, N, 19º2, E in the Southern Baltic Proper 54º33, N, 1º12, E in the Belt Sea 54º36, N, 11º13, E in the Belt Sea All values below the limit of detection (LOD) have been omitted from the calculations. Reported LOD values have been indicated as asterisks in the graphs. No uncertainty has been reported on sediment data.

3 THE LIST OF GRAPHS AND TABLES OF THE MORS DATA OF GRAPHS BIOTA HERRING Figure Cs (Bq/kg of wet weight) in herring muscle (without head and entrails) Figure Cs (Bq/kg of wet weight) in herring muscle (filets) Figure 3. 9 Sr (Bq/kg of wet weight) in herring muscle (without head and entrails) Figure 4. 9 Sr (Bq/kg of wet weight) in herring muscle (filets) PLAICE AND FLOUNDER Figure Cs (Bq/kg of wet weight) in plaice and flounder muscle (filets) Figure 6. 9 Sr (Bq/kg of wet weight) in plaice and flounder muscle (filets) COD Figure Cs (Bq/kg of wet weight) in cod muscle (filets) Figure 8. 9 Sr (Bq/kg of wet weight) in cod muscle (filets) FUCUS VESICULOSUS Figure Cs (Bq/kg of dry weight) in Fucus vesiculosus SEA WATER SURFACE Figures 1a and 1b. 137 Cs (Bq/m 3 ) in surface water Figures 11a and 11b. 9 Sr (Bq/m 3 ) in surface water Figures 12a and 12b. 239,24 Pu (Bq/m 3 ) in surface water BOTTOM Figures 13a and 13b. 137 Cs (Bq/m 3 ) in bottom water Figures 14a and 14b. 9 Sr (Bq/m 3 ) in bottom water Figures 15a and 15b. 239,24 Pu (Bq/m 3 ) in bottom water SEDIMENT Figure 16a. 137 Cs (Bq/kg) in sediment at 9 stations (variable scale) Figure 16b. 137 Cs (Bq/kg) in sediment at 9 stations Figure 17a. 4 K (Bq/kg) in sediment at 9 stations (variable scale) Figure 17b. 4 K (Bq/kg) in sediment at 9 stations

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25 3 CVI EB LL3a TEILI STOLGR 15 BY P FBELT1 1 P Figure 16a. Annual average Cs concentrations (Bq/kg) in sediment at some stations in Note: variable scale in graphs Printed in SYKE, Helsinki 19 May 28 24

26 14 CVI STOLGR Figure 16b. Annual average in EB TEILI FBELT P Cs concentrations (Bq/kg) in sediment LL3a BY at some stations Printed in SYKE, Helsinki 19 May 28 P

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