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  Philippines/Laoag - Enhanced Radiosonde by PAGASA
                      during the YMC-BSM 2018 field campaign

  drafted						30 Dec 2023
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1. Summary

This dataset contains enhanced (4 times/day) radiosonde data taken 
at PAGASA Laoag Synop-Airport-Upper Air station.
During this campaign period, Lockheed Martin LMS6 radiosonde with 
LMG6 Radiosonde Ground System was used.


2. Spatial Type

vertical profile


3. Frequency

Six hourly (Nominal time; 0000, 0600, 1200, 1800 UTC)


4. Temporal coverage

From	2018-07-01 0000 UTC
To	2018-08-31 1800 UTC


5. Spatial coverage	

Launched at (18.18N, 120.53E)


6. Remarks

(1) Based on intercomparison with Vaisala RS41 as well as GNSS-derived
precipitable water vapor, CDF (cumulative distribution function) method
was applied to match relative humidity data of LMS6 onto RS41 RH data.
A table which contains correction values is provided just for reference.
Since correction has already been applied, there is no need to add those
values onto datasets contained here.

(2) Near the ground surface, heating in the daytime was confirmed.
Thus, two types of datasets are provided; one is no correction for this
heating (indicated as level-3.2/4.2), and the other is corrected based
on the method of Yoneyama et al. (2002) (indicated as level-3.3/4.3).

(3) Data archived here are the same as that in YMC-BSM 2018 IOP data.

If you have questions, please contact "ymc-joffice @ jamstec.go.jp".


7. References

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

Yoneyama, K., M. Fujita, A. Seiki, R. Shirooka, S. Yokoi, E. O. Cayanan,
C. O. Iglesia, and O. C. Cabrera, 2021: Evaluation of LMS6 and RS41 radiosonde
humidity data obtained during YMC-Boreal Summer Monsoon study in 2018 and 2020.
J. Meteor. Soc. Japan, 99, 1115-1125. https://doi.org/10.2151/jmsj.2021-054


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