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Understanding intersatellite biases of microwave humidity sounders using global simultaneous nadir overpasses
Met Office Hadley Centre, Exeter.
Luleå tekniska universitet, Institutionen för system- och rymdteknik, Rymdteknik.
Luleå tekniska universitet, Institutionen för system- och rymdteknik, Rymdteknik.ORCID-id: 0000-0001-6389-1160
Met Office Hadley Centre, Exeter.
Vise andre og tillknytning
2012 (engelsk)Inngår i: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202, Vol. 117, s. D02305-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Simultaneous nadir overpasses (SNOs) of polar-orbiting satellites are most frequent in polar areas but can occur at any latitude when the equatorial crossing times of the satellites become close owing to orbital drift. We use global SNOs of polar orbiting satellites to evaluate the intercalibration of microwave humidity sounders from the more frequent high-latitude SNOs. We have found based on sensitivity analyses that optimal distance and time thresholds for defining collocations are pixel centers less than 5 km apart and time differences less than 300 s. These stringent collocation criteria reduce the impact of highly variable surface or atmospheric conditions on the estimated biases. Uncertainties in the estimated biases are dominated by the combined radiometric noise of the instrument pair. The effects of frequency changes between different versions of the humidity sounders depend on the amount of water vapor in the atmosphere. There are significant scene radiance and thus latitude dependencies in the estimated biases and this has to taken into account while intercalibrating microwave humidity sounders. Therefore the results obtained using polar SNOs will not be representative for moist regions, necessitating the use of global collocations for reliable intercalibration.

sted, utgiver, år, opplag, sider
2012. Vol. 117, s. D02305-
HSV kategori
Forskningsprogram
Rymdteknik
Identifikatorer
URN: urn:nbn:se:ltu:diva-12725DOI: 10.1029/2011JD016349ISI: 000299703300001Scopus ID: 2-s2.0-84856606901Lokal ID: be41331c-9e63-4b61-8655-f9bb667f277aOAI: oai:DiVA.org:ltu-12725DiVA, id: diva2:985676
Merknad
Validerad; 2012; Bibliografisk uppgift: Article Number: D02305 ; 20120223 (andbra)Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2018-07-10bibliografisk kontrollert

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