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Title: Influence of explicit Phaeocystis parameterizations on the global distribution of marine dimethyl sulfide

Abstract

Dimethyl sulfide (DMS) is a biogenic organosulfur compound which contributes strongly to marine aerosol mass and the determination of cloud condensation nuclei over the remote oceans. Since uncertainties in DMS flux to the atmosphere lead to large variations in climate forcing, the global DMS distribution has been the subject of increasingly complex dynamic simulations. DMS concentrations are directly controlled by marine ecosystems. Phaeocystis is a major DMS producer but is often omitted from global reduced sulfur mechanisms. Here we incorporate this phytoplankton group into the marine ecosystem-biogeochemical module of the Community Earth System Model. To examine its role in the ocean sulfur cycle, an earlier DMS model has been enhanced to include new knowledge gained over the last few years. Results from the baseline run show that simulated Phaeocystis biomass generally agrees with observations, with high concentrations near the Antarctic continent and between 50° and 60° north. Given the new explicit Phaeocystis representation, the DMS distribution shows significant improvements, especially regarding the amplitude and location of high-latitude peaks. The simulated global mean surface DMS value is 2.26 nM, comparable to an estimate of 2.34 nM from the latest climatology extrapolated based on observations. The total oceanic DMS source to themore » atmosphere is 20.4 Tg S/yr, on the low side of previous estimates. Comparisons with and without Phaeocystis show that the group dominates DMS distributions in temperate and cold waters, contributing 13% of the global flux. The proportion may increase as sea ice declines and should be considered in climate projections.« less

Authors:
 [1];  [1];  [1];  [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Atmospheric, Earth, and Energy Division
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1366897
Alternate Identifier(s):
OSTI ID: 1558202
Report Number(s):
LLNL-JRNL-669432; LA-UR-15-22565
Journal ID: ISSN 2169-8953
Grant/Contract Number:  
AC52-07NA27344; 89233218CNA000001
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Geophysical Research. Biogeosciences
Additional Journal Information:
Journal Volume: 120; Journal Issue: 11; Journal ID: ISSN 2169-8953
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES; dimethyl sulfide; Phaeocystis; CESM; DMS simulation; Biological Science

Citation Formats

Wang, Shanlin, Elliott, Scott, Maltrud, Mathew, and Cameron-Smith, Philip. Influence of explicit Phaeocystis parameterizations on the global distribution of marine dimethyl sulfide. United States: N. p., 2015. Web. doi:10.1002/2015JG003017.
Wang, Shanlin, Elliott, Scott, Maltrud, Mathew, & Cameron-Smith, Philip. Influence of explicit Phaeocystis parameterizations on the global distribution of marine dimethyl sulfide. United States. doi:10.1002/2015JG003017.
Wang, Shanlin, Elliott, Scott, Maltrud, Mathew, and Cameron-Smith, Philip. Wed . "Influence of explicit Phaeocystis parameterizations on the global distribution of marine dimethyl sulfide". United States. doi:10.1002/2015JG003017. https://www.osti.gov/servlets/purl/1366897.
@article{osti_1366897,
title = {Influence of explicit Phaeocystis parameterizations on the global distribution of marine dimethyl sulfide},
author = {Wang, Shanlin and Elliott, Scott and Maltrud, Mathew and Cameron-Smith, Philip},
abstractNote = {Dimethyl sulfide (DMS) is a biogenic organosulfur compound which contributes strongly to marine aerosol mass and the determination of cloud condensation nuclei over the remote oceans. Since uncertainties in DMS flux to the atmosphere lead to large variations in climate forcing, the global DMS distribution has been the subject of increasingly complex dynamic simulations. DMS concentrations are directly controlled by marine ecosystems. Phaeocystis is a major DMS producer but is often omitted from global reduced sulfur mechanisms. Here we incorporate this phytoplankton group into the marine ecosystem-biogeochemical module of the Community Earth System Model. To examine its role in the ocean sulfur cycle, an earlier DMS model has been enhanced to include new knowledge gained over the last few years. Results from the baseline run show that simulated Phaeocystis biomass generally agrees with observations, with high concentrations near the Antarctic continent and between 50° and 60° north. Given the new explicit Phaeocystis representation, the DMS distribution shows significant improvements, especially regarding the amplitude and location of high-latitude peaks. The simulated global mean surface DMS value is 2.26 nM, comparable to an estimate of 2.34 nM from the latest climatology extrapolated based on observations. The total oceanic DMS source to the atmosphere is 20.4 Tg S/yr, on the low side of previous estimates. Comparisons with and without Phaeocystis show that the group dominates DMS distributions in temperate and cold waters, contributing 13% of the global flux. The proportion may increase as sea ice declines and should be considered in climate projections.},
doi = {10.1002/2015JG003017},
journal = {Journal of Geophysical Research. Biogeosciences},
number = 11,
volume = 120,
place = {United States},
year = {2015},
month = {10}
}

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