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The form, distribution and palaeoclimatic implications of cirques in southwest Turkey (Western Taurus)
Geomorphology ( IF 3.1 ) Pub Date : 2021-08-05 , DOI: 10.1016/j.geomorph.2021.107885
I.S. Evans 1 , Z. Çılğın 2 , C. Bayrakdar 3 , E. Canpolat 4
Affiliation  

The Taurus Mountains of southwest Turkey are split into numerous separated ranges, of which eleven supported former glaciers. We describe cirques and related moraines in four new locations, as well as those in seven ranges where glaciation was previously known. This gives a complete inventory of the 85 cirques in southwest Turkey. These are comparable in size to those elsewhere, but narrower and often less developed. Lengths averaging 672 m are high relative to widths of 542 m. Overall axial gradients average 22.4°. Cirque floor altitudes are controlled largely by altitudes of the mountains above, but they also vary in relation to precipitation, in sympathy with ELAs (Equilibrium Line Altitudes) of former glaciers. In most ranges where glaciers were short (extending little beyond cirques), ELA can be predicted from mean mid-floor altitude. Our observations demonstrate lower ELAs than in previous literature. Both ELAs and cirque floors rise eastward in the west, and northward inland from the coast. This supports the importance of winds from the west and southwest, off the Mediterranean Sea, bringing LGM (Last Glacial Maximum) conditions wetter than present to mountains near the coast. Cirques face on average a little east of north, showing the effects of shade and differential solar radiation receipt.



中文翻译:

土耳其西南部(西金牛座)太阳马戏团的形式、分布和古气候意义

土耳其西南部的金牛座山脉被分成许多独立的山脉,其中有 11 个支撑着前冰川。我们描述了四个新地点的冰斗和相关冰碛,以及先前已知冰川作用的七个范围内的冰碛。这提供了土耳其西南部 85 个马戏团的完整清单。这些在规模上与其他地方相当,但更窄,而且往往不太发达。相对于 542 m 的宽度,平均长度为 672 m。整体轴向梯度平均为 22.4°。Cirque 地板高度主要由上面山脉的高度控制,但它们也随降水而变化,与前冰川的 ELA(平衡线高度)一致。在冰川较短的大多数范围内(几乎不超出冰斗),ELA 可以从平均地底高度预测。我们的观察表明 ELA 低于以前的文献。ELA 和 Cirque 地板都从西部向东升起,从海岸向北向内陆升起。这证明了来自地中海附近的西风和西南风的重要性,使 LGM(末次冰期最大值)条件比现在更潮湿到海岸附近的山脉。Cirques 平均面向北偏东一点,显示了阴影和不同太阳辐射接收的影响。

更新日期:2021-08-15
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