Nitrogen fixation in the East China Sea and southern Yellow Sea during summer 2006
National Natural Science Foundation of China [41125020]; National Key Basic Research Special Foundation Program of China [2005CB422305]; Fujian Natural Science Foundation [2009J06026] Nitrogen fixation in the subtropical East China Sea (ECS) and the southern Yellow Sea (YS) were measured using N-15(...
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ftxiamenuniv:oai:dspace.xmu.edu.cn:2288/87746 2023-05-15T17:35:25+02:00 Nitrogen fixation in the East China Sea and southern Yellow Sea during summer 2006 Zhang, Run Chen, Min Cao, Jianping Ma, Qiang Yang, Junhong Qiu, Yusheng 陈敏 2012 http://dspace.xmu.edu.cn/handle/2288/87746 en_US eng MAR ECOL PROG SER MARINE ECOLOGY PROGRESS SERIES, 2012,447:77-86 WOS:000300660600006 http://dspace.xmu.edu.cn/handle/2288/87746 http://dx.doi.org/10.3354/meps09509 TROPICAL NORTH-ATLANTIC CONTINENTAL-SHELF N-2 FIXATION SEASONAL-VARIATION KUROSHIO WATER PACIFIC-OCEAN RIVER NITRATE PHYTOPLANKTON TRICHODESMIUM Article 2012 ftxiamenuniv 2020-07-21T11:42:21Z National Natural Science Foundation of China [41125020]; National Key Basic Research Special Foundation Program of China [2005CB422305]; Fujian Natural Science Foundation [2009J06026] Nitrogen fixation in the subtropical East China Sea (ECS) and the southern Yellow Sea (YS) were measured using N-15(2) tracer assay during June and July 2006. Depth-integrated nitrogen fixation (2 to 221 mu mol N m(-2) d(-1)) was highest in the oceanic main path of the Kuroshio Current in the northeastern ECS, and in the mesohaline (surface salinity 30 to 34) stations. Very little N-2 fixation was encountered in the low-salinity (surface salinity <30) area, and we suggest that N-2 fixation was hindered by the nutrient conditions (lack of 'excess' phosphate relative to nitrate, xsPO(4) = [PO4] -[NO3]/16) near the Changjiang (Yangtze River) mouth. In the mesohaline waters, N-2 fixation was positively correlated with the vertical density (sigma(t)) gradient in the upper water column (30 m), indicating that N-2 fixation can also be controlled by physical regime, and enhanced water column stratification may promote N-2 fixation during summer. N-2 fixation met 0.01 to 4.6% of nitrogen demand by primary production, suggesting that N-2 fixation was not a major contributor to primary production in the study area. Estimated new N flux by N-2 fixation to the ECS continental shelf (13 Gg N) during summer is at the same order of magnitude as atmospheric deposition, but much lower than either the Kuroshio subsurface water upwelling or the Changjiang riverine input. Article in Journal/Newspaper North Atlantic Xiamen University Institutional Repository Pacific |
institution |
Open Polar |
collection |
Xiamen University Institutional Repository |
op_collection_id |
ftxiamenuniv |
language |
English |
topic |
TROPICAL NORTH-ATLANTIC CONTINENTAL-SHELF N-2 FIXATION SEASONAL-VARIATION KUROSHIO WATER PACIFIC-OCEAN RIVER NITRATE PHYTOPLANKTON TRICHODESMIUM |
spellingShingle |
TROPICAL NORTH-ATLANTIC CONTINENTAL-SHELF N-2 FIXATION SEASONAL-VARIATION KUROSHIO WATER PACIFIC-OCEAN RIVER NITRATE PHYTOPLANKTON TRICHODESMIUM Zhang, Run Chen, Min Cao, Jianping Ma, Qiang Yang, Junhong Qiu, Yusheng 陈敏 Nitrogen fixation in the East China Sea and southern Yellow Sea during summer 2006 |
topic_facet |
TROPICAL NORTH-ATLANTIC CONTINENTAL-SHELF N-2 FIXATION SEASONAL-VARIATION KUROSHIO WATER PACIFIC-OCEAN RIVER NITRATE PHYTOPLANKTON TRICHODESMIUM |
description |
National Natural Science Foundation of China [41125020]; National Key Basic Research Special Foundation Program of China [2005CB422305]; Fujian Natural Science Foundation [2009J06026] Nitrogen fixation in the subtropical East China Sea (ECS) and the southern Yellow Sea (YS) were measured using N-15(2) tracer assay during June and July 2006. Depth-integrated nitrogen fixation (2 to 221 mu mol N m(-2) d(-1)) was highest in the oceanic main path of the Kuroshio Current in the northeastern ECS, and in the mesohaline (surface salinity 30 to 34) stations. Very little N-2 fixation was encountered in the low-salinity (surface salinity <30) area, and we suggest that N-2 fixation was hindered by the nutrient conditions (lack of 'excess' phosphate relative to nitrate, xsPO(4) = [PO4] -[NO3]/16) near the Changjiang (Yangtze River) mouth. In the mesohaline waters, N-2 fixation was positively correlated with the vertical density (sigma(t)) gradient in the upper water column (30 m), indicating that N-2 fixation can also be controlled by physical regime, and enhanced water column stratification may promote N-2 fixation during summer. N-2 fixation met 0.01 to 4.6% of nitrogen demand by primary production, suggesting that N-2 fixation was not a major contributor to primary production in the study area. Estimated new N flux by N-2 fixation to the ECS continental shelf (13 Gg N) during summer is at the same order of magnitude as atmospheric deposition, but much lower than either the Kuroshio subsurface water upwelling or the Changjiang riverine input. |
format |
Article in Journal/Newspaper |
author |
Zhang, Run Chen, Min Cao, Jianping Ma, Qiang Yang, Junhong Qiu, Yusheng 陈敏 |
author_facet |
Zhang, Run Chen, Min Cao, Jianping Ma, Qiang Yang, Junhong Qiu, Yusheng 陈敏 |
author_sort |
Zhang, Run |
title |
Nitrogen fixation in the East China Sea and southern Yellow Sea during summer 2006 |
title_short |
Nitrogen fixation in the East China Sea and southern Yellow Sea during summer 2006 |
title_full |
Nitrogen fixation in the East China Sea and southern Yellow Sea during summer 2006 |
title_fullStr |
Nitrogen fixation in the East China Sea and southern Yellow Sea during summer 2006 |
title_full_unstemmed |
Nitrogen fixation in the East China Sea and southern Yellow Sea during summer 2006 |
title_sort |
nitrogen fixation in the east china sea and southern yellow sea during summer 2006 |
publisher |
MAR ECOL PROG SER |
publishDate |
2012 |
url |
http://dspace.xmu.edu.cn/handle/2288/87746 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
http://dx.doi.org/10.3354/meps09509 |
op_relation |
MARINE ECOLOGY PROGRESS SERIES, 2012,447:77-86 WOS:000300660600006 http://dspace.xmu.edu.cn/handle/2288/87746 |
_version_ |
1766134586484457472 |