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Evaluating the relationship between wildfire extent and nitrogen dry deposition in a boreal forest in interior Alaska
https://nipr.repo.nii.ac.jp/records/14036
https://nipr.repo.nii.ac.jp/records/1403631f825a2-2935-4bb5-aa69-649d3fda1116
| Item type | 学術雑誌論文 / Journal Article(1) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 公開日 | 2017-02-28 | |||||||||
| タイトル | ||||||||||
| タイトル | Evaluating the relationship between wildfire extent and nitrogen dry deposition in a boreal forest in interior Alaska | |||||||||
| タイトル | ||||||||||
| タイトル | Evaluating the relationship between wildfire extent and nitrogen dry deposition in a boreal forest in interior Alaska | |||||||||
| 言語 | en | |||||||||
| 言語 | ||||||||||
| 言語 | eng | |||||||||
| キーワード | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | Nitrogen deposition | |||||||||
| キーワード | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | Biomass burning | |||||||||
| キーワード | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | Sub-Arctic forest | |||||||||
| キーワード | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | Climate change | |||||||||
| キーワード | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | Regression analysis | |||||||||
| 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 |
Nagano, Hirohiko
× Nagano, Hirohiko
× Iwata, Hiroki
|
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| 抄録 | ||||||||||
| 内容記述タイプ | Abstract | |||||||||
| 内容記述 | Alaska wildfires may play an important role in nitrogen (N) dry deposition in Alaskan boreal forests. Here we used annual N dry deposition data measured by CASTNET at Denali National Park (DEN417) during 1999–2013, to evaluate the relationships between wildfire extent and N dry deposition in Alaska. We established six potential factors for multiple regression analysis, including burned area within 100 km of DEN417 (BA100km) and in other distant parts of Alaska (BAAK), the sum of indexes of North Atlantic Oscillation and Arctic Oscillation (OI), number of days with negative OI (OIday), precipitation (PRCP), and number of days with PRCP (PRCPday). Multiple regression analysis was conducted for both time scales, annual (using only annual values of factors) and six-month (using annual values of BAAK and BA100km, and fire and non-fire seasons' values of other four factors) time scales. Together, BAAK, BA100km, and OIday, along with PRCPday in the case of the six-month scale, explained more than 92% of the interannual variation in N dry deposition. The influence of BA100km on N dry deposition was ten-fold greater than from BAAK; the qualitative contribution was almost zero, however, due to the small BA100km. BAAK was the leading explanatory factor, with a 15 ± 14% contribution. We further calculated N dry deposition during 1950–2013 using the obtained regression equation and long-term records for the factors. The N dry deposition calculated for 1950–2013 revealed that an increased occurrence of wildfires during the 2000s led to the maximum N dry deposition exhibited during this decade. As a result, the effect of BAAK on N dry deposition remains sufficiently large, even when large possible uncertainties (>40%) in the measurement of N dry deposition are taken into account for the multiple regression analysis. | |||||||||
| 内容記述 | ||||||||||
| 内容記述タイプ | Other | |||||||||
| 内容記述 | アラスカの森林火災は当地北方林における大気からの窒素沈着に対して重要な役割を果たしている可能性がある。これを検証するため、本研究では、アラスカ内陸部のデナリ国立公園内にあるCASTNET観測所で測定された1999から2013年までの年間窒素乾性沈着量に対して、森林火災面積や大気振動、降水量などを説明変数とする重回帰分析を行った。検討した説明変数のうち、観測所から100 km以上離れた場所で発生したアラスカの年間火災面積（BAAK）が沈着量の年々変動に最も大きく寄与していた（15 ± 14%）。さらに得られた回帰式を用いて過去64年分の窒素乾性沈着量を再現したところ、火災面積の増加により2000年代の沈着量が最大であったことが明らかになった。 | |||||||||
| 書誌情報 |
en : Polar Science 巻 11, p. 96-104, 発行日 2017-03 |
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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://dx.doi.org/10.1016/j.polar.2016.11.002 | |||||||||
| 関連名称 | 10.1016/j.polar.2016.11.002 | |||||||||
