caa a22 4500 467937524 CHVBK 20180406153001.0 cr unu---uuuuu 170328e20061101xx s 000 0 eng 10.1007/s00703-005-0169-0 doi (NATIONALLICENCE)springer-10.1007/s00703-005-0169-0 A new method for estimation of near surface specific humidity over global oceans [Elektronische Daten] [R. Singh, P. C. Joshi, C. M. Kishtawal, P. K. Pal] Summary: A new methodology for deriving daily averages of near surface specific humidity (Q a ) is developed. Remotely sensed parameters, total water vapor (W), boundary-layer water vapor (W b ), and sea-surface temperature (SST) are used to derive Q a . Genetic algorithm (GA) is used to find the empirical function relating the input (W, W b , and SST) and output (Q a ) parameters. The input data consist of 2 years (1999-2000) of daily W, W b , from SSM/I (Special Sensor Microwave Imager), and SST data from AVHRR (Advanced Very High Resolution Radiometer). COADS (Comprehensive Ocean Atmospheric Data Set) observations of Q a are used to develop and evaluate the new methodology. The performance of the algorithm is measured with COADS observations, which are not used in the development phase. The global mean rms error for daily averages Q a is 1.5 ± 0.40 g/kg. Slightly higher discrepancies between Q a derived from the new method and COADS observations are found over the Northwestern Pacific, North Atlantic oceans and Arabian Sea. This method improves upon the humidity retrieval of Liu (1986), Schulz et al (1993), and Chou et al (1997). Springer-Verlag, 2006 Singh R. Atmospheric Sciences Division, Meteorology and Oceanography Group, Space Applications Centre (ISRO), Ahmedabad, India aut Joshi P. C. Atmospheric Sciences Division, Meteorology and Oceanography Group, Space Applications Centre (ISRO), Ahmedabad, India aut Kishtawal C. M. Atmospheric Sciences Division, Meteorology and Oceanography Group, Space Applications Centre (ISRO), Ahmedabad, India aut Pal P. K. Atmospheric Sciences Division, Meteorology and Oceanography Group, Space Applications Centre (ISRO), Ahmedabad, India aut Meteorology and Atmospheric Physics Springer-Verlag 94/1-4(2006-11-01), 1-10 0177-7971 94:1-4<1 2006 94 703 https://doi.org/10.1007/s00703-005-0169-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00703-005-0169-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Singh R. Atmospheric Sciences Division, Meteorology and Oceanography Group, Space Applications Centre (ISRO), Ahmedabad, India aut NATIONALLICENCE 700 1- Joshi P. C. Atmospheric Sciences Division, Meteorology and Oceanography Group, Space Applications Centre (ISRO), Ahmedabad, India aut NATIONALLICENCE 700 1- Kishtawal C. M. Atmospheric Sciences Division, Meteorology and Oceanography Group, Space Applications Centre (ISRO), Ahmedabad, India aut NATIONALLICENCE 700 1- Pal P. K. Atmospheric Sciences Division, Meteorology and Oceanography Group, Space Applications Centre (ISRO), Ahmedabad, India aut NATIONALLICENCE 773 0- Meteorology and Atmospheric Physics Springer-Verlag 94/1-4(2006-11-01), 1-10 0177-7971 94:1-4<1 2006 94 703 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer