FN Archimer Export Format
PT J
TI Atlantic Equatorial Undercurrent intensification counteracts warming-induced deoxygenation
BT 
AF BRANDT, Peter
   HAHN, Johannes
   SCHMIDTKO, Sunke
   TUCHEN, Franz Philip
   KOPTE, Robert
   KIKO, Rainer
   BOURLES, Bernard
   CZESCHEL, Rena
   DENGLER, Marcus
AS 1:1,2;2:1;3:1;4:1;5:3;6:1,4;7:5;8:1;9:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;
C1 GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
   Faculty of Mathematics and Natural Sciences, Kiel University, Kiel, Germany
   Institute of Geosciences, Kiel University, Kiel, Germany
   Laboratoire d’Océanographie de Villefranche, Sorbonne Université, Villefranche-sur-Mer, France
   Instrumentation, Moyens Analytiques, Observations en Géophysique et Océanographie, IRD, Plouzané, France
C2 IFM GEOMAR, GERMANY
   UNIV KIEL, GERMANY
   UNIV KIEL, GERMANY
   UNIV PARIS 06, FRANCE
   IRD, FRANCE
SI BREST
SE IRD
IF 21.531
TC 23
UR https://archimer.ifremer.fr/doc/00882/99403/109496.pdf
LA English
DT Article
CR PIRATA
AB The tropical Atlantic upper-ocean circulation experiences multiannual to decadal changes associated with different climate modes and is simultaneously adjusting to climate warming. The most energetic current in the tropical Atlantic is the Equatorial Undercurrent (EUC), which flows eastwards along the Equator. On the basis of long-term moored observations, we show that the EUC strengthened by more than 20% from 2008 to 2018. The intensification of the EUC is associated with increasing subsurface oxygen concentrations and a thickening of the upper-ocean oxygenated layer in the equatorial Atlantic. These changes counteract climate-warming-induced deoxygenation in the region. The EUC strengthening is found to be mainly forced by trade wind changes in the western tropical North Atlantic. A 60-yr dataset reveals that the recent oxygen increase in the upper equatorial Atlantic is associated with multidecadal variability. This variability is characterized by low oxygen concentrations in the 1990s and early 2000s, and high oxygen concentrations in the 1960s and 1970s. The observed oxygen variability seems to be linked to a compression and expansion of the habitat of tropical pelagic fish, and must be accounted for when evaluating the possible consequences of deoxygenation for marine ecosystems and fisheries. Recent strengthening of the Equatorial Undercurrent counteracts warming-induced deoxygenation in the equatorial Atlantic, according to an analysis of long-term moored observations. 
PY 2021
PD MAY
SO Nature Geoscience
SN 1752-0894
PU Nature Research
VL 14
IS 5
UT 000641196100001
BP 278
EP 282
DI 10.1038/s41561-021-00716-1
ID 99403
ER

EF