scholarly journals Differential coupling of bacterial and primary production in mesotrophic and oligotrophic systems of the East China Sea

2001 ◽  
Vol 23 ◽  
pp. 273-282 ◽  
Author(s):  
FK Shiah ◽  
TY Chen ◽  
GC Gong ◽  
CC Chen ◽  
KP Chiang ◽  
...  
Keyword(s):  
Primary Production ◽  
East China Sea ◽  
East China ◽  
The East China Sea ◽  
China Sea ◽  
Differential Coupling

scholarly journals Impacts of climate change and emissions on atmospheric oxidized nitrogen deposition over East Asia

2019 ◽  
Vol 19 (2) ◽  
pp. 887-900 ◽  
Author(s):  
Junxi Zhang ◽  
Yang Gao ◽  
L. Ruby Leung ◽  
Kun Luo ◽  
Huan Liu ◽  
...  
Keyword(s):  
Climate Change ◽  
Primary Production ◽  
East China Sea ◽  
East China ◽  
Anthropogenic Emissions ◽  
The East China Sea ◽  
Ship Emissions ◽  
China Sea ◽  
Emission Changes ◽  
Marine Primary Production

Abstract. A multi-model ensemble of Atmospheric Chemistry and Climate Model Intercomparison Project (ACCMIP) simulations is used to study the atmospheric oxidized nitrogen (NOy) deposition over East Asia under climate and emission changes projected for the future. Both dry and wet NOy deposition show significant decreases in the 2100s under RCP4.5 and RCP8.5, primarily due to large anthropogenic emission reduction over both land and sea. However, in the near future of the 2030s, both dry and wet NOy deposition increase significantly due to continued increase in emissions. Marine primary production from both dry and wet NOy deposition increases by 19 %–34 % in the 2030s and decreases by 34 %–63 % in the 2100s over the East China Sea. The individual effect of climate or emission changes on dry and wet NOy deposition is also investigated. The impact of climate change on dry NOy deposition is relatively minor, but the effect on wet deposition, primarily caused by changes in precipitation, is much higher. For example, over the East China Sea, wet NOy deposition increases significantly in summer due to climate change by the end of this century under RCP8.5, which may subsequently enhance marine primary production. Over the coastal seas of China, as the transport of NOy from land becomes weaker due to the decrease in anthropogenic emissions, the effect of ship emissions and lightning emissions becomes more important. On average, the seasonal mean contribution of ship emissions to total NOy deposition is projected to be enhanced by 24 %–48 % and 3 %–37 % over the Yellow Sea and East China Sea, respectively, by the end of this century. Therefore, continued control of both anthropogenic emissions over land and ship emissions may reduce NOy deposition to the Chinese coastal seas.

scholarly journals Inter-shelf nutrient transport from the East China Sea as a major nutrient source supporting winter primary production on the northeast South China Sea shelf

2013 ◽  
Vol 10 (12) ◽  
pp. 8159-8170 ◽  
Author(s):  
A. Q. Han ◽  
M. H. Dai ◽  
J. P. Gan ◽  
S.-J. Kao ◽  
X. Z. Zhao ◽  
...  
Keyword(s):  
South China Sea ◽  
Primary Production ◽  
East China Sea ◽  
South China ◽  
East China ◽  
Lower Latitude ◽  
Coastal Current ◽  
Northeast Monsoon ◽  
The East China Sea ◽  
China Sea

Abstract. The East China Sea (ECS) and the South China Sea (SCS) are two major marginal seas of the North Pacific with distinct seasonal variations of primary productivity. Based upon field observations covering both the ECS and the northern SCS (NSCS) during December 2008–January 2009, we examined southward long-range transport of nutrients from the ECS to the northeastern SCS (NESCS) carried by the China Coastal Current (CCC) driven by the prevailing northeast monsoon in wintertime. These escaped nutrients from the ECS shelf, where primary production (PP) was limited in winter, might however refuel the PP on the NESCS shelf at lower latitude, where the water temperature remained favorable, but river-sourced nutrients were limited. By combining the field observation of nitrate+nitrite (NO3+NO2, DIN) with our best estimate of volume transport of the CCC, we derived a first-order estimate for DIN flux of 1430 ± 1024 mol s−1. Under the assumption that DIN was the limiting nutrient, such southward DIN transport would have stimulated 8.84 ± 6.33 × 1011 gC of new production (NP), accounting for 33–74% of the NP or 14–22% of PP in winter on the NESCS shelf shallower than 100 m.

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