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Evidence of climate change impact upon glaciers' recession within the Italian Alps

机译：气候变化对意大利阿尔卑斯山冰川衰退影响的证据

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摘要

We present evidence of climate change impact upon recent changes of glaciers within Lombardy region, in Northern Italy. We illustrate the recent area evolution of a set of 249 glaciers in the area using three surface area records for 1991,1999 and 2003. The 1999 and 2003 surface area data are processed by combining glacier limits manually digitized upon registered color orthophotos and differential GPS (DGPS) glaciers' surveys. Glaciers' area was 117.4 km~2 in 1991, 104.7 km~2 in 1999, and to 92.4 km~2 2003, with a 21% reduction. Glaciers smaller than 1 km~2 accounted for 53% of the total loss in area (13.1 km~2 during 1991-2003). The area change rate was higher lately, with ca. 11.7 % reduction during 1999-2003. We split Alps and fore Alps of Lombardy into six mountain groups, and we separately investigate relative area variations. We use climate series from local stations within each group to assess climate change during a 30-year window (1976-2005). We focus upon temperature and snow cover depth at thaw, known to impact glaciers' changes. We compare local year-round temperature anomalies against global ones to evidence enhanced warming within this area, and we investigate the correlation of our target climate variables against NAO. Eventually, we highlight the link between the rate of change of our climate variables to the observed scaling of area loss against glaciers' size, showing that in rapidly warming areas glaciers' size affects less relative melting.
机译：我们提供了气候变化对意大利北部伦巴第地区冰川近期变化的影响的证据。我们使用1991、1999和2003年的三个表面积记录说明了该地区249个冰川的近期区域演变。通过将已注册彩色正射影像和差分GPS手动数字化的冰川极限值结合起来，处理了1999年和2003年的表面积数据（ DGPS）冰川调查。冰川面积在1991年为117.4 km〜2，在1999年为104.7 km〜2，到2003年为92.4 km〜2，减少了21％。小于1 km〜2的冰川占总损失的53％（1991-2003年期间为13.1 km〜2）。面积变化率最近较高，约为。 1999-2003年期间减少了11.7％。我们将伦巴第大区的阿尔卑斯山和前阿尔卑斯山分为六个山脉，并分别调查相对面积变化。我们使用每个组中本地站点的气候序列来评估30年内（1976-2005年）的气候变化。我们关注融化时的温度和积雪深度，已知会影响冰川的变化。我们将当地全年的温度异常与全球的异常进行了比较，以证明该地区的变暖加剧，并且我们调查了目标气候变量与NAO的相关性。最终，我们强调了气候变量的变化率与观测到的面积减少与冰川尺寸之间的关系之间的联系，表明在快速变暖的地区，冰川尺寸对相对融化的影响较小。

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  • 来源
    《Theoretical and applied climatology》 |2012年第4期|p.429-445|共17页
  • 作者

    G. Diolaiuti; D. Bocchiola; C. Dagata; C. Smiraglia;

  • 作者单位

    Earth Science Department, Universita degli Studi di Milano, Mangiagalli 34, Milan, Italy;

    Department I.I.A.R., Politecnico di Milano, C.I.M.I. Section, 32 Leonardo da Vinci Sq., 20133 Milan, Italy;

    Earth Science Department, Universita degli Studi di Milano, Mangiagalli 34, Milan, Italy;

    Earth Science Department, Universita degli Studi di Milano, Mangiagalli 34, Milan, Italy;

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