FN Archimer Export Format
PT J
TI Impact of Nonzero Intercept Gas Transfer Velocity Parameterizations on Global and Regional Ocean-Atmosphere CO2 Fluxes
BT 
AF RIBAS-RIBAS, Mariana
   BATTAGLIA, Gianna
   HUMPHREYS, Matthew P.
   WURL, Oliver
AS 1:1;2:2,3;3:4;4:1;
FF 1:;2:;3:;4:;
C1 Carl von Ossietzky Univ Oldenburg, Ctr Marine Sensors, Inst Chem & Biol Marine Environm, D-26129 Wilhelmshaven, Germany.
   Univ Bern, Climate & Environm Phys, Phys Inst, CH-3012 Bern, Switzerland.
   Univ Bern, Oeschger Ctr Climate Change Res, CH-3012 Bern, Switzerland.
   Univ East Anglia, Sch Environm Sci, Ctr Ocean & Atmospher Sci, Norwich NR4 7TJ, Norfolk, England.
C2 UNIV OLDENBURG, GERMANY
   UNIV BERN, SWITZERLAND
   UNIV BERN, SWITZERLAND
   UNIV E ANGLIA, UK
IN DOAJ
TC 3
UR https://archimer.ifremer.fr/doc/00675/78732/80994.pdf
   https://archimer.ifremer.fr/doc/00675/78732/80995.pdf
LA English
DT Article
CR OISO - OCÉAN INDIEN SERVICE D'OBSERVATION
DE ;gas transfer velocity;low wind speed;carbon dioxide;ocean-atmosphere CO2 flux;carbon cycle
AB Carbon dioxide (CO2) fluxes between the ocean and atmosphere (FCO2) are commonly computed from differences between their partial pressures of CO2 (pCO(2)) and the gas transfer velocity (k). Commonly used wind-based parameterizations for k imply a zero intercept, although in situ field data below 4 m s(-1) are scarce. Considering a global average wind speed over the ocean of 6.6 m s(-1), a nonzero intercept might have a significant impact on global FCO2. Here, we present a database of 245 in situ measurements of k obtained with the floating chamber technique (Sniffle), 190 of which have wind speeds lower than 4 m s(-1). A quadratic parameterization with wind speed and a nonzero intercept resulted in the best fit for k. We further tested FCO2 calculated with a different parameterization with a complementary pCO(2) observation-based product. Furthermore, we ran a simulation in a well-tested ocean model of intermediate complexity to test the implications of different gas transfer velocity parameterizations for the natural carbon cycle. The global ocean observation-based analysis suggests that ignoring a nonzero intercept results in an ocean-sink increase of 0.73 Gt C yr(-1). This corresponds to a 28% higher uptake of CO2 compared with the flux calculated from a parameterization with a nonzero intercept. The differences in FCO2 were higher in the case of low wind conditions and large pCO(2) between the ocean and atmosphere. Such conditions occur frequently in the Tropics. 
PY 2019
PD MAY
SO Geosciences
SN 2076-3263
PU Mdpi
VL 9
IS 5
UT 000470966100039
DI 10.3390/geosciences9050230
ID 78732
ER

EF