FN Archimer Export Format
PT J
TI Organic Carbon Export and Loss Rates in the Red Sea
BT 
AF Kheireddine, Malika
   Dall'Olmo, Giorgio
   Ouhssain, Mustapha
   Krokos, George
   Claustre, Hervé
   Schmechtig, Catherine
   Poteau, Antoine
   Zhan, Peng
   Hoteit, Ibrahim
   Jones, Burton H.
AS 1:1;2:2,3;3:1;4:4;5:5;6:6;7:5;8:4;9:4;10:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;
C1 Red Sea Research Center (RSRC), Biological and Environmental Sciences and Engineering Division (BESE) King Abdullah University of Science and Technology (KAUST) Thuwal ,Saudi Arabia
   Plymouth Marine Laboratory Plymouth, UK
   National Centre for Earth Observation Plymouth, UK
   Faculty of Earth Science and Engineering King Abdullah University of Science and Technology (KAUST) Thuwal ,Saudi Arabia
   Laboratoire d'Océanographie de Villefranche Sorbonne Université, CNRS UMR 7093 Villefranche‐sur‐mer ,France
   OSU Ecce‐Terra Sorbonne Université, CNRS, UMS 3455 Paris, France
C2 KAUST, SAUDI ARABIA
   PML, UK
   NERC, UK
   KAUST, SAUDI ARABIA
   UNIV SORBONNE, FRANCE
   CNRS, FRANCE
IF 5.703
TC 17
UR https://archimer.ifremer.fr/doc/00655/76730/77877.pdf
   https://archimer.ifremer.fr/doc/00655/76730/77878.docx
LA English
DT Article
DE ;carbon export;carbon loss rates;mesopelagic zone;temperature;oxygen;tropical ecosystem
AB The export and fate of organic carbon in the mesopelagic zone are still poorly understood and quantified due to lack of observations. We exploited data from a biogeochemical‐Argo float that was deployed in the Red Sea to study how a warm and hypoxic environment can affect the fate of the organic carbon in the ocean's interior. We observed that only 10% of the particulate organic carbon (POC) exported survived at depth due to remineralization processes in the upper mesopelagic zone. We also found that POC exported was rapidly degraded in a first stage and slowly in a second one, which may be dependent on the palatability of the organic matter. We observed that apparent oxygen utilization (AOU)‐based loss rates (a proxy of the remineralization of total organic matter) were significantly higher than the POC‐based loss rates, likely because changes in AOU are mainly attributed to changes in dissolved organic carbon. Finally, we showed that POC‐ and AOU‐based loss rates could be expressed as a function of temperature and oxygen concentration. These findings advance our understanding of the biological carbon pump and mesopelagic ecosystem. 
PY 2020
PD OCT
SO Global Biogeochemical Cycles
SN 0886-6236
PU American Geophysical Union (AGU)
VL 34
IS 10
UT 000586572100008
DI 10.1029/2020GB006650
ID 76730
ER

EF