FN Archimer Export Format
PT J
TI The Relationship Between Nitrate and Potential Density in the Ocean South of 30 degrees S
BT 
AF XU, Dan
   WANG, Tao
   XING, Xiaogang
   BIAN, Changwei
AS 1:1,2;2:1;3:3;4:4;
FF 1:;2:;3:;4:;
C1 Key Laboratory of Marine Environment and Ecology, Ocean University of China, Qingdao, China
   College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao, Shandong, China
   State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, China
   Frontiers Science Center for Deep Ocean Multispheres and Earth System (FDOMES) and Physical Oceanography Laboratory, Ocean University of China, Qingdao, China
C2 UNIV OCEAN CHINA, CHINA
   UNIV OCEAN CHINA, CHINA
   MINIST NAT RESOURCE, CHINA
   UNIV OCEAN CHINA, CHINA
IF 3.6
TC 1
UR https://archimer.ifremer.fr/doc/00824/93592/100349.pdf
   https://archimer.ifremer.fr/doc/00824/93592/100350.pdf
LA English
DT Article
CR OISO - OCÉAN INDIEN SERVICE D'OBSERVATION
DE ;BGC-Argo;the Southern Ocean;nitrate-density relationship;Subantarctic Mode Water;nitracline;predicted nitrate
AB As a main source of nitrate for the pycnocline in the global ocean, the ocean south of 30 degrees S plays a pivotal role in the global marine biogeochemical cycle. Nitrate in the pycnocline often shows a more stable relationship with density than with depth. Hence, it is important to understand the nitrate structure and its relationship with density in the ocean south of 30 degrees S. In the present study, the nitrate-density relationship and the mechanisms for its variability are studied based on the data from more than 60,000 profiles. Through analysis, we find that nitrate is approximately linearly correlated with potential density in the nitracline, except for the western boundary current zones. The upper bounds of the nitracline depend on the mixed layer and euphotic layer depth. The lower bounds are related to the depth of maximum nitrate, which mainly vary meridionally with sharp changes near the Subantarctic Front. The diapycnal gradients of nitrate also show meridional variability, with large magnitudes corresponding to thick Subantarctic Mode Water, low diapycnal mixing in the nitracline, and high biological uptake in the euphotic layer. The nitrate-density relationship can be applied to predict nitrate concentrations based on the observed temperature and salinity profiles and support some detailed studies on the physical-biogeochemical interactions. Two examples show that the predicted nitrate data could help better resolve the effects of ocean circulations and mesoscale eddies on nitrate than the existing observed nitrate profiles. 
PY 2022
PD NOV
SO Journal Of Geophysical Research-oceans
SN 2169-9275
PU Amer Geophysical Union
VL 127
IS 11
UT 000888191600001
DI 10.1029/2022JC018948
ID 93592
ER

EF