Biological lability of terrestrial DOM increases CO2 outgassing across Arctic shelves
Biological lability of terrestrial DOM increases CO2 outgassing across Arctic shelves
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陆地 DOM 的生物不稳定性增加了北极大陆架的二氧化碳排放
DOI:
10.1007/s10533-022-00961-5
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发表时间:
2022
期刊:
影响因子:
4
通讯作者:
Polimene L
中科院分区:
文献类型:
--
作者:
Polimene L
Arctic shelf seas receive greater quantities of river runoff than any other ocean region and are experiencing increased freshwater loads and associated terrestrial matter inputs since recent decades. Amplified terrestrial permafrost thaw and coastal erosion is exposing previously frozen organic matter, enhancing its mobilization and release to nearshore regions. Changing terrestrial dissolved organic matter (terr-DOM) loads and composition may alter shelf primary productivity and respiration, ultimately affecting net regional CO2air–sea fluxes. However, the future evolution of Arctic Ocean climate feedbacks are highly dependent upon the biological degradability of terr-DOM in coastal waters, a factor often omitted in modelling studies. Here, we assess the sensitivity of CO2air–sea fluxes from East Siberian Arctic Shelf (ESAS) waters to changing terr-DOM supply and degradability using a biogeochemical model explicitly accounting for bacteria dynamics and shifting terr-DOM composition. We find increasing terr-DOM loads and degradability trigger a series of biogeochemical and ecological processes shifting ESAS waters from a net sink to a net source of CO2, even after accounting for strengthening coastal productivity by additional land-derived nutrients. Our results suggest that future projected inputs of labile terr-DOM from peat and permafrost thaw may strongly increase the CO2efflux from the Arctic shelf sea, causing currently unquantified positive feedback to climate change.
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DOI:
--
发表时间:
2009
期刊:
影响因子:
--
作者:
M. Manizza;M. Follows;S. Dutkiewicz;J. McClelland;D. Menemenlis;C. Hill;A. Townsend‐Small;B. Peterson
通讯作者:
B. Peterson
影响因子:
2.8
作者:
C. Wegner;J. Hölemann;I. Dmitrenko;S. Kirillov;K. Tuschling;E. Abramova;H. Kassens
通讯作者:
C. Wegner;J. Hölemann;I. Dmitrenko;S. Kirillov;K. Tuschling;E. Abramova;H. Kassens
影响因子:
5.2
作者:
Cooper, L. W.;McClelland, J. W.;Peterson, B. J.
通讯作者:
Peterson, B. J.
影响因子:
4.9
作者:
J. Salvadó;T. Tesi;M. Sundbom;Emma Karlsson;M. Kruså;I. Semiletov;E. Panova;Ö. Gustafsson
通讯作者:
Ö. Gustafsson
影响因子:
1.8
作者:
S. Yasunaka;A. Murata;E. Watanabe;M. Chierici;A. Fransson;S. Heuven;M. Hoppema;M. Ishii;T. Johannessen;N. Kosugi;S. Lauvset;J. Mathis;S. Nishino;A. Omar;A. Olsen;D. Sasano;Taro Takahashi;R. Wanninkhof
通讯作者:
S. Yasunaka;A. Murata;E. Watanabe;M. Chierici;A. Fransson;S. Heuven;M. Hoppema;M. Ishii;T. Johannessen;N. Kosugi;S. Lauvset;J. Mathis;S. Nishino;A. Omar;A. Olsen;D. Sasano;Taro Takahashi;R. Wanninkhof