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  Philippines/Legazpi - Operational Radiosonde by PAGASA
                        and Enhanced Radiosonde during the YMC-BSM 2020

  drafted						30 Dec 2023
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1. Summary

This dataset contains twice-daily operational radiosodne data at PAGASA
Legazpi station as well as enhanced (4 times/day) ones obtained during 
the YMC-BSM 2020 intensive observation period.
Note that Vaisala RS41-SG radisondes were used.


2. Spatial Type

vertical profile


3. Frequency

2 times/days (Mar. 3 - May 25, July 8 - Aug.  10, Sept. 17 - Sept. 25)
4 times/days (Aug. 11 - Sept. 16)


4. Temporal coverage

From	2020-03-03 0000 UTC
To	2020-09-25 0000 UTC


5. Spatial coverage	

Launched at (13.15N, 123.73E)


6. Remarks

Some surface wind data stored as (0 deg, 0 m/s) were replaced with "9999" 
to indicate they are missing values.
Two types of data sets were made based on the difference of near ground
surface temperature and humidity data corrections. When the temperature
and humidity data near the ground surface were corrected, those are stored
in level-3.1 and level-4.1, respectively. This type is adequate if researchers
study synoptic-/large-scale atmospheric condition, while non-corrected data 
might be adequate to see actual local circulation. See the following reference 
for more details on the correction method.


7. Reference

Yoneyama, K., M. Hanyu, S. Sueyoshi, F. Yoshiura, and M. Katsumata, 2002: 
Radiosonde observation from the ship in the tropical region. JAMSTECR, 45, 31-39. 
https://www.godac.jamstec.go.jp/doc_catalog/external/metadata/shiken45_04/file/shiken45_04.pdf


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