In: Geophysical Research Letters, 33 (2006),
Vorschau |
PDF, Englisch
Download (106kB) | Nutzungsbedingungen |
Abstract
We re-assess the constraints that estimates of the global ocean excess radiocarbon inventory place on air-sea gas exchange. We found that the gas exchange scaling parameter aq cannot be constrained by the excess radiocarbon inventory alone. Non-negligible biases in different global wind speed datasets require a careful adaptation of aq to the wind field chosen. Furthermore, aq depends on the spatial and temporal resolution of the wind fields. We develop a new wind speed- and inventory-normalized gas exchange parameter aqN which takes into account these biases and which is easily adaptable to any new estimate of the ocean excess radiocarbon inventory. Our study yields an average estimate of aq of 0.32+/-0.05 for monthly mean winds, lower than the previous estimate (0.39) from Wwanninkhof (1992). We calculate a global annual average piston velocity for CO2 of (16.7+/-2.9) cm/hr and a gross CO2 flux between atmosphere and ocean of (73+/-10) PgC/yr, significantly lower than results from previous studies.
Dokumententyp: | Artikel |
---|---|
Titel der Zeitschrift: | Geophysical Research Letters |
Band: | 33 |
Erstellungsdatum: | 08 Aug. 2006 14:21 |
Erscheinungsjahr: | 2006 |
Institute/Einrichtungen: | Fakultät für Physik und Astronomie > Institut für Umweltphysik |
DDC-Sachgruppe: | 530 Physik |
Normierte Schlagwörter: | Kohlenstoffkreislauf |
Freie Schlagwörter: | Gasaustausch , Radiokohlenstoffgas exchange , radiocarbon , carbon cycle |
Zusätzliche Informationen: | L11802, doi:1029/2005GL025408 |