From the surface, radiosonde and Doppler radar Band - L data in Serpong, Indonesia (6° 24 ‘ S - 106° 42’ E), measured were performed during drought (1993) and rainy (1994) seasons, when BLAT characteristics were studied. Radar data were validated with soundings through statistical methods (correlation index, average and standard deviation). BLAT structure were interpreted through radar echo (wind), continuously observed through day over study period. BLAT evident characteristics in this region had been associated to diurnal ML (Mixing Layer) that reached 0.3 km at morning and 3-5 km at afternoon, were observed a steady and growth diurnal cycle, due to heating and cooling surface. Main characteristics between seasons were at 0300 LT (Local Time) presents intensity and direction of wind behaviors, but still remained during day an ample distinction between them. In drought season, intensity and direction of wind were more changeable than rainy season, result observed in BLAT height. Acquired information under BLR (Boundary Layer Radar), shown the existence of pronounced diurnal sharp variation on BLAT in clear days. Were verified that BLAT diurnal variation had an evident influence to existence of breeze sea circulation confirmed by BLR in 12/10/93 day. Radar data validation were carried through information of soundings and had presented significant resulting, where drought season regression coefficients had varied between 0.83 and 0.94, as much as intensity as direction, and rainy season had been 0.77 - 0.88 (intensity) and in direction they had been in order of 0.3. Proved that radar measures are equivalents to soundings, with benefit to being able continuous data, proving that using observations must be important role in low level tropical atmosphere study.
radiosonde; Doppler radar; breeze-sea; Indonesia
