Global POC Synthesis Global POC Synthesis from Beam Attenuation from Beam Attenuation Data Data collected during JGOFS, collected during JGOFS, WOCE and other programs WOCE and other programs A.V. Mishonov, W.D. Gardner, A.V. Mishonov, W.D. Gardner, & M.J. Richardson & M.J. Richardson Department of Oceanography Department of Oceanography Texas A & M University Texas A & M University College Station College Station
22
Embed
Global POC Synthesis from Beam Attenuation Data collected during JGOFS, WOCE and other programs A.V. Mishonov, W.D. Gardner, & M.J. Richardson Department.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
Global POC Synthesis from Global POC Synthesis from Beam Attenuation DataBeam Attenuation Data
collected during JGOFS, WOCE collected during JGOFS, WOCE and other programsand other programs
Department of Oceanography Department of Oceanography Texas A & M University Texas A & M University
College StationCollege Station
SMP meeting, WH-2000 2
BackgroundBackground
One of the major goals of JGOFS is to develop One of the major goals of JGOFS is to develop
regional and global mass balances for carbon. regional and global mass balances for carbon.
Selected areasSelected areas were studied through shipboard were studied through shipboard
sampling during JGOFS in the last 15 years. sampling during JGOFS in the last 15 years.
To To extend global coverageextend global coverage, the marine carbon , the marine carbon
dioxide survey was integrated with WOCE. dioxide survey was integrated with WOCE.
SMP meeting, WH-2000 3
IntroductionIntroductionTo obtain information about POC distribution it is To obtain information about POC distribution it is
possible to use possible to use in-situin-situ optical instruments - e.g. optical instruments - e.g. transmissometer and convert beam attenuation transmissometer and convert beam attenuation to POC. to POC.
In order to In order to extend our data coverage to a global extend our data coverage to a global levellevel, we convinced many WOCE scientists to , we convinced many WOCE scientists to interface our transmissometers on their WOCE interface our transmissometers on their WOCE cruises during the last decade. cruises during the last decade.
We now have an opportunity to reduce & We now have an opportunity to reduce & synthesize the data collected. synthesize the data collected.
SMP meeting, WH-2000 4
ObjectivesObjectives Reduce and quality control the transmissometer data Reduce and quality control the transmissometer data
from 17 WOCE cruises, providing accessibility and from 17 WOCE cruises, providing accessibility and compatibility with JGOFS data for input to models of compatibility with JGOFS data for input to models of carbon cycling, aggregation / disaggregation, etc.carbon cycling, aggregation / disaggregation, etc.
Establish new ocean- or region-specific algorithms to Establish new ocean- or region-specific algorithms to estimate global POC standing stock in the surface estimate global POC standing stock in the surface ocean from satellite back-scatter data and our ocean from satellite back-scatter data and our transmissometer data sets.transmissometer data sets.
Explore whether the relationship between COExplore whether the relationship between CO22
drawdown and POC concentration can be used to drawdown and POC concentration can be used to estimate POC export from surface waters.estimate POC export from surface waters.
SMP meeting, WH-2000 5
Data SetData SetTransmissometer data have been collected using Transmissometer data have been collected using
instruments provided by our group over the last instruments provided by our group over the last decade in collaboration with WOCE, JGOFS, and decade in collaboration with WOCE, JGOFS, and other large-scale hydrographic programs. other large-scale hydrographic programs.
These data include basin-wide transects in the North These data include basin-wide transects in the North and South Atlantic, North and South Pacific, and South Atlantic, North and South Pacific, Indian, and Southern Oceans. Indian, and Southern Oceans.
We have been funded to analyze these data and We have been funded to analyze these data and convert the beam attenuation values to POC using convert the beam attenuation values to POC using the Beam Attenuation:POC relationships derived the Beam Attenuation:POC relationships derived by our group during JGOFS Process studies. by our group during JGOFS Process studies.
More data will be included from:More data will be included from: JGOFS: 22 cruises, 410/1568 Sts/CastsJGOFS: 22 cruises, 410/1568 Sts/Casts SAVE, WBEX, MCTT, SAVE, WBEX, MCTT, etcetc: 9 cruises, 600 Sts (est.): 9 cruises, 600 Sts (est.)
TTN-043 Arabian Sea 08-Jan-95 01-Feb-95TTN-045 Arabian Sea 14-Mar-95 08-Apr-95TTN-049 Arabian Sea 18-Jul-95 13-Aug-95TTN-050 Arabian Sea 18-Aug-95 13-Sep-95TTN-054 Arabian Sea 30-Nov-95 26-Dec-95