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Net mass balance calculations for the Shirase Drainage Basin, east Antarctica, using the mass budget method
https://nipr.repo.nii.ac.jp/records/12702
https://nipr.repo.nii.ac.jp/records/127026a9d896f-350b-4a5a-8b50-9d36f6b7b1f8
Item type | 学術雑誌論文 / Journal Article(1) | |||||
---|---|---|---|---|---|---|
公開日 | 2016-05-31 | |||||
タイトル | ||||||
タイトル | Net mass balance calculations for the Shirase Drainage Basin, east Antarctica, using the mass budget method | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Net mass balance calculations for the Shirase Drainage Basin, east Antarctica, using the mass budget method | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Shirase Glacier | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Ice flow | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Grounding line | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Ice mass balance | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Remote sensing | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
アクセス権 | ||||||
アクセス権 | metadata only access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
著者 |
Nakamura, Kazuki
× Nakamura, Kazuki× Yamanokuchi, Tsutomu× Doi, Koichiro× Shibuya, Kazuo |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | We quantify the mass budget of the Shirase drainage basin (SHI), Antarctica, by separately estimating snow accumulation (surface mass balance; SMB) and glacier ice mass discharge (IMD). We estimated the SMB in the SHI, using a regional atmospheric climate model (RACMO2.1). The SMB of the mainstream A flow region was 12.1 ± 1.5 Gt a−1 for an area of 1.985 × 105 km2. Obvious overestimation of the model round the coast, ∼0.5 Gt a−1, was corrected for. For calculating the IMD, we employed a 15-m resolution Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) with a digital elevation model (DEM) to determine the heights at the grounding line (GL), after comparison with the interpolated Bamber DEM grid heights; the results of this are referred to as the measured heights. Ice thickness data at the GL were inferred by using a free-board relationship between the measured height and the ice thickness, and considering the measured firn depth correction (4.2 m with the reference ice density of 910 kg m−3) for the nearby blue-ice area. The total IMD was estimated to be 14.0 ± 1.8 Gt a−1. Semi-empirical firn densification model gives the estimate within 0.1–0.2 Gt a−1 difference. The estimated net mass balance, –1.9 Gt a−1, has a two-σ uncertainty of ±3.3 Gt a−1, and probable melt water discharge strongly suggests negative NMB, although the associated uncertainty is large. | |||||
内容記述 | ||||||
内容記述タイプ | Other | |||||
内容記述 | 東南極の白瀬流域における質量収支(NMB)を、積雪涵養量(SMB)と氷河による氷の排出量(IMD)を別個に推定して定量化した。SMBはRACMO2.1モデルを用いて推定し、地上測量による沿岸過大評価量を補正した。白瀬氷河の主流Aにおいて12.1 ± 1.5 Gt a–1であった。IMDの算出に当たり、接地線(GL)における標高を、BamberらによるDEMと比較・参照して決定した。GLにおける氷厚データは、GLでの標高と氷厚のフリーボード関係から推定したが、その時、実測による青氷領域の氷密度−深さ分布を参照してフィルン補正を施した。以上から、全IMDは14.0 ± 1.8 Gt a–1と推定され、半経験フィルン圧密モデルを用いても差は0.1〜0.2 Gt a–1であった。NMB = SMB – IMDは–1.9 Gt a–1と推定され、不確定性は2σで±3.3 Gt a–1である。このように不確定性は大きいものの、融解水の排出量を無視したことを考慮すれば、負のNMBになることは間違いないと考えられる。 | |||||
書誌情報 |
en : Polar Science 巻 10, 号 2, p. 111-122, 発行日 2016-06 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 18739652 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | http://doi.org/10.1016/j.polar.2016.04.008 | |||||
関連名称 | 10.1016/j.polar.2016.04.008 |