FN Archimer Export Format
PT J
TI Quantifying Errors in Observationally Based Estimates of Ocean Carbon Sink Variability
BT 
AF GLOEGE, Lucas
   MCKINLEY, Galen A.
   LANDSCHUETZER, Peter
   FAY, Amanda R.
   FROELICHER, Thomas L.
   FYFE, John C.
   ILYINA, Tatiana
   JONES, Steve
   LOVENDUSKI, Nicole S.
   RODGERS, Keith B.
   SCHLUNEGGER, Sarah
   TAKANO, Yohei
AS 1:1;2:1;3:2;4:1;5:3,4;6:5;7:2;8:6;9:7;10:8,9;11:10;12:2,11;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;
C1 Lamont Doherty Earth Observ, Palisades, NY 10964 ,USA.
   Max Planck Inst Meteorol, Hamburg, Germany.
   Univ Bern, Climate & Environm Phys, Bern, Switzerland.
   Univ Bern, Oeschger Ctr Climate Change Res, Bern, Switzerland.
   Environm & Climate Change Canada, Victoria, BC, Canada.
   Univ Bergen, Bergen, Norway.
   Univ Colorado, Boulder, CO 80309 ,USA.
   Inst Basic Sci, Ctr Climate Phys, Busan, South Korea.
   Pusan Natl Univ, Busan, South Korea.
   Princeton Univ, Princeton, NJ 08544 ,USA.
   Los Alamos Natl Lab, Los Alamos, NM,USA.
C2 LDEO, USA
   MAX PLANCK INST METEOROL, GERMANY
   UNIV BERN, SWITZERLAND
   UNIV BERN, SWITZERLAND
   ENVIRONM & CLIMATE CHANGE CANADA, CANADA
   UNIV BERGEN, NORWAY
   UNIV COLORADO, USA
   ICCP, SOUTH KOREA
   UNIV PUSAN NATL, SOUTH KOREA
   UNIV PRINCETON, USA
   LOS ALAMOS NATL LAB, USA
IF 6.5
TC 53
UR https://archimer.ifremer.fr/doc/00700/81200/85441.pdf
   https://archimer.ifremer.fr/doc/00700/81200/85442.docx
LA English
DT Article
CR OISO - OCÉAN INDIEN SERVICE D'OBSERVATION
DE ;CO2 flux;large ensemble;pCO2;SOM‐FFN
AB Reducing uncertainty in the global carbon budget requires better quantification of ocean CO2 uptake and its temporal variability. Several methodologies for reconstructing air-sea CO2 exchange from pCO(2) observations indicate larger decadal variability than estimated using ocean models. We develop a new application of multiple Large Ensemble Earth system models to assess these reconstructions' ability to estimate spatiotemporal variability. With our Large Ensemble Testbed, pCO(2) fields from 25 ensemble members each of four independent Earth system models are subsampled as the observations and the reconstruction is performed as it would be with real-world observations. The power of a testbed is that the perfect reconstruction is known for each of the original model fields; thus, reconstruction skill can be comprehensively assessed. We find that a neural-network approach can skillfully reconstruct air-sea CO2 fluxes when it is trained with sufficient data. Flux bias is low for the global mean and Northern Hemisphere, but can be regionally high in the Southern Hemisphere. The phase and amplitude of the seasonal cycle are accurately reconstructed outside of the tropics, but longer-term variations are reconstructed with only moderate skill. For Southern Ocean decadal variability, insufficient sampling leads to a 31% (15%:58%, interquartile range) overestimation of amplitude, and phasing is only moderately correlated with known truth (r = 0.54 [0.46:0.63]). Globally, the amplitude of decadal variability is overestimated by 21% (3%:34%). Machine learning, when supplied with sufficient data, can skillfully reconstruct ocean properties. However, data sparsity remains a fundamental limitation to quantification of decadal variability in the ocean carbon sink. 
PY 2021
PD APR
SO Global Biogeochemical Cycles
SN 0886-6236
PU Amer Geophysical Union
VL 35
IS 4
UT 000644999800009
DI 10.1029/2020GB006788
ID 81200
ER

EF