Data/hora: 12/06/2024 12:29:25

Provedor de dados: 	5	
País: 	France	
Título: 	Global average of air-sea CO2 transfer velocity from QuikSCAT scatterometer wind speeds	
Autores: 	Boutin, J.; Quilfen, Yves; Merlivat, L.; Piolle, Jean-francois.	
Data: 	2009-04	
Ano: 	2009	
Palavras-chave: 	CO2 transfer velocity; QuikSCAT; CARIOCA.	
Resumo: 	The absolute calibration of the relationship between air-sea CO2 transfer velocity, k, and wind speed, U, has been a topic of debate for some time, because k global average, &lt; k &gt;, as deduced from Geochemical Ocean Sections Study oceanic C-14 inventory has differed from that deduced from experimental k-U relationships. Recently, new oceanic C-14 inventories and inversions have lead to a lower &lt; k &gt;. In addition, new measurements performed at sea in high-wind speed conditions have led to new k-U relationship. Meanwhile, quality and sampling of satellite wind speeds has greatly improved. The QuikSCAT scatterometer has provided high-quality wind speeds for more than 7 years. This allows us to estimate the global distributions of k computed using k-U relationships and temperature-dependent Schmidt numbers from 1999 to 2006. Given the difficulty of measuring in situ wind speed very accurately, we performed a sensitivity study of the &lt; k &gt; uncertainty which results from QuikSCAT U uncertainties. New QuikSCAT-buoy U comparisons in the northern Atlantic Ocean and in the Southern Ocean confirm the excellent precision of QuikSCAT U (RMS difference of about 1 m s(-1)), but it is possible that QuikSCAT overestimates wind speeds by 5%, leading to a possible overestimation of k derived with quadratic relationships by 10%. The &lt; k &gt; values obtained with two recent experimental k-U relationships are very close, between 15.9 and 17.9 cm h(-1), and within the error bar of k average deduced from the new oceanic C-14 inventory.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	http://archimer.ifremer.fr/doc/2009/publication-6394.pdf

DOI:10.1029/2007JC004168	
Editor: 	American Geophysical Union	
Relação: 	http://archimer.ifremer.fr/doc/00000/6394/	
Formato: 	application/pdf	
Fonte: 	Journal of Geophysical Research ( JGR ) - Oceans (0148-0227) (American Geophysical Union), 2009-04 , Vol. 114 , N. C04007 , P. 1-14	
Fonte: 	2009 American Geophysical Union