Database for instantaneous retrievals at pixel scale should include:
For certain periods, dependent on what is available on the in-situ side, the in-situ database should include:
In the context of the global ocean observing system we recommend to bring out more high-quality bouys as validation reference and a retrieval development data base.
|Data Set||Coverage||Time Resolution||Spatial Resolution||Period|
|Curry et al.||COARE IFA||3h||0. 5° x 0.5°||11/92-02/93|
|2° x 2.5°||07/87-12/94|
0.5° x 0.5°
1° x 1°
2.5° x 2.5°
|Jones et al.||Global||Monthly||1° x 1°||01/88-12/98 continued|
|Kubota et al.||Global||3d
|1° x 1°||01/91-12/95|
|Analysis and Reanalysis||Global||6h||1° x 1°|
|Pathfinder TOVS||Global||Twice daily||1° x 1°||87-94|
All datasets cover the period 01/91-12/94.
Organize a catalog like we have done in the JSC/SCOR group.
Status Summary: There is some hope of getting useful values of qa from satellite on daily time scales. Ta remains very difficult. 4DVAR assimilation of SSM/I and other data may provide the best values until profiling sensors provide observations in the atmospheric boundary layer (hopefully NPOESS). There was considerable debate about Curry's proposal of doing regional diagnostic studies. Many are opposed because regional algorithms will introduce "seams" in the analyzed fields and global algorithms are more aesthetically pleasing. The proponents of the regional approach say that "seams" are the least of our problems and can be dealt with in a variety of ways; if we want to infer values at higher resolution than we can sense directly, this is the only approach that will work. The bottom line is that the Ta, qa problem is difficult; however it hasn't been worked as hard as the wind and SST fields, so further efforts should be directed to this topic.