Refinement of Surface Precipitation Estimates for the Dual-frequency Precipitation Radar on the GPM Core Observatory Using Near-Nadir Measurements
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- HIROSE Masafumi
- Faculty of Science and Technology, Meijo University, Nagoya, Japan
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- SHIGE Shoichi
- Graduate School of Science, Kyoto University, Kyoto, Japan
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- KUBOTA Takuji
- Earth Observation Research Center, Japan Aerospace Exploration Agency, Tsukuba, Japan
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- FURUZAWA Fumie A.
- Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan
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- MINDA Haruya
- Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan
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- MASUNAGA Hirohiko
- Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan
書誌事項
- タイトル別名
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- Refinement of Surface Precipitation Estimates for the Dual-frequency Precipitation Radar on the GPM Core Observatory Using Near-Nadir Measurements : Special Edition on Global Precipitation Measurement (GPM) : 5th Anniversary
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抄録
<p> Precipitation statistics from Global Precipitation Measurement Core Observatory Dual-frequency Precipitation Radar (GPM DPR) are underestimated due to systematic bias depending on the scanning angle. Over five years of GPM DPR KuPR Version 06A data, the precipitation anomaly is −7% and −2% over land and ocean, respectively. This study improves the estimation of low-level precipitation-rate profiles and the detection of shallow storms (with top heights of ≤2.5 km), using reference datasets of near-nadir measurements. </p><p> First, the low-level precipitation profile (LPP) is updated using an a priori near-nadir database generated from structural-characteristics related variables of the precipitation and environmental parameters. The LPP correction increases precipitation over areas where downward-increasing precipitation profiles are dominant below 2 km, such as at high elevations and at middle and high latitudes. Globally, the LPP correction increases precipitation by 5%. Second, the effect on precipitation data of missing shallow storms is estimated using the angle-bin difference in the detectability of storms with a top height of ≤2.5 km. The effect of the shallow-precipitation deficiency (SPD) is comparable in magnitude to that of the LPP correction. A priori lookup tables for the SPD correction, constrained by the clutter-free bottom level and spatially averaged shallow-precipitation fractions, are constructed so that the correction applies to gridded statistics at 0.1° and three-month scales. The SPD correction enhances precipitation by 50% over specific low-rainfall oceans in the sub-tropics and at high latitudes, where shallow precipitation dominates. Based on these two corrections, precipitation increases by 8% and 11% over land and ocean, respectively. At latitudes between 60° N and 60° S, the difference in KuPR compared with satellite-gauge blended products is reduced from −17% to −9%, whereas with gauge-based products is reduced from −19% to −15% over land. </p>
収録刊行物
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- 気象集誌. 第2輯
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気象集誌. 第2輯 advpub (0), 1231-1252, 2021
公益社団法人 日本気象学会
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詳細情報 詳細情報について
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- CRID
- 1390288292974938880
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- NII論文ID
- 130008112052
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- NII書誌ID
- AA00702524
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- ISSN
- 21869057
- 00261165
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- NDL書誌ID
- 031774280
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可