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https://doi.org/10.5194/acp-2020-513
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-513
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  01 Jul 2020

01 Jul 2020

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This preprint is currently under review for the journal ACP.

Measurement report: Immediate impact of the Taal volcanic eruption on atmospheric temperature observed from COSMIC-2 RO measurements

Saginela Ravindra Babu and Yuei-An Liou Saginela Ravindra Babu and Yuei-An Liou
  • Center for Space and Remote Sensing Research, National Central University, Taiwan

Abstract. For the first time after 43 years of its previous eruption in 1977, the Taal volcano in the Philippines (14° N, 120.59° E) erupted in the afternoon of 12 January, 2020. Interestingly, the Taal volcanic eruption was associated with a strong anticyclonic circulation at the upper levels over the western Pacific region in the northern hemisphere. As a result, the volcanic plumes were carried through the background upper level strong winds to the anticyclone over the Pacific Ocean within a few days following the eruption. In this study, the detailed vertical structure and the day-to-day temperature variability in response to the eruption is delineated by using high-resolution temperature measurements from the recently launched Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC)-2 radio occultation (RO) data. We describe the vertical temperature structure near (within 2 degree radius) and away (~ 5 degree radius) from the volcano during its intense eruption day (13 January 2020). A significant temperature inversion at ~ 15 km altitude is observed in the nearest temperature profiles (within 2 degree radius). Multiple tropopauses are evident in the temperature profiles that are available away from the volcano (~ 5 degree radius). The cloud top altitude of 15.2 km detected from the RO bending angle anomaly method is demonstrated. Furthermore, the diurnal temperature and relative humidity anomalies are estimated over ± 5° latitude and longitude radius from the volcano center and over the region of 10–20° N, 160–180° E with respect to the mean temperature of one week before the eruption. A persistent warming layer is observed at 16–19 km altitude range in both regions for several days after the eruption. A strong increase of ~ 50 % relative humidity at 15 km altitude is also noticed just after the eruption in the Taal volcano region. The present work shows the advantages and usefulness of the newly-launched COSMIC-2 data for near real-time temperature monitoring at shorter time scales with sufficient data.

Saginela Ravindra Babu and Yuei-An Liou

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Saginela Ravindra Babu and Yuei-An Liou

Saginela Ravindra Babu and Yuei-An Liou

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Latest update: 29 Sep 2020
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This is the first paper to utilize the high-resolution temperature measurements from the recently launched COSMIC-2 radio occultation data to delineate the detailed vertical structure and day-to-day temperature variability in response to the eruption of the Taal volcano in January 2020.
This is the first paper to utilize the high-resolution temperature measurements from the...
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