一路向北-目標:北極!之-阿拉斯加掃蕩游,絕美最後處女地
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南極冰的形成: 原始形態的結晶雪花,在地面熱力和自身壓力作用下,重新結晶變成顆粒狀的粒雪,繼而細粒雪經過合併再結晶逐漸變成中粒、粗粒雪。底層的粒雪在上層粒雪的壓力下,發生緩慢沉降壓實,進一步重結晶而變成粒冰。在粒雪變成粒冰的過程中,融化的水沿粒雪顆粒間的空隙下滲,將底部的粒雪凍結起來,使原先存在於顆粒間的空氣被封閉而成為氣泡。粒冰含氣泡較多,氣泡的體積也較大,看起來顏色泛白,故有“白冰”之稱。粒冰繼續受壓的結果,排除一部分氣泡,並使留在冰中的氣泡壓縮得很小,逐漸變成更加堅硬純凈的冰塊,在光的照射下放射藍色的塊冰----冰川冰。這是冰川冰與水冰不同的地方。這個過程非常緩慢,一般需要數十年,甚至數百年。冰川冰的年齡越老,冰體越顯得清澈燦爛。進一步,當積累的壓力足夠大和時間足夠長時,冰川底層的某一部位冰中的空氣被完全的壓出,形成超級密度堅硬的冰的核心。這個緻密的冰核,有的會隨著時間流逝也隨著冰川從南極大陸上向海洋緩緩的移動、斷裂,最終墜入南極的冰海之中,因為密度高,光線通過率高,在強光下就像海中漂浮的黑色物體。只要出水,黑冰就是完全透明。
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1\. 藍色山脊公園道 Blue Ridge Parkway, 北卡羅來納 州至維吉尼亞州,500英里
2\. 12號公路 Route 12, Utah, 猶他州 潘圭奇(Panguitch)至 托里 (Torrey)
3\. 山脊路 Trail Ridge Road, 科羅拉多州 的(Rocky Mountain National Park)山脊路是全美海拔最高的一段公路,有12183呎高。
4\. 夏威夷大島 環島公路,Big Island,300英里。
5\. 1號跨海公路,Oversea Highway, 佛羅里達 至西礁島(Key West),113英里。
6\. 太平洋海岸公路 Pacific Coast Highway,加州1號公路。
7\. 矢車菊花道 Bluebonnet Trail, 德州 奧斯汀 (Austin)至休士頓(Houston)
8\. Glenn格蘭公路和Richardson理查森公路 安格雷奇(Anchorage)至 瓦爾迪茲 (Valdez)
從 阿拉斯加 的安格雷奇至瓦爾狄茲的這段路途連接了兩段公路,一共300英里長,沿途儘是史前就存在的壯麗冰河景觀和山脈,山巒疊起、錯落有致,甚至有許多超過14000呎的高峰至今都還沒有名字,還可以看到橫貫 阿拉斯加 的輸油管系統。
9\. 向陽大道 Going to the Sun Road 蒙大拿州 冰河國家公園(Glacier National Park)
10\. 陶斯 之路 The High Road, 新墨西哥州 聖塔非(Santa Fe)至 陶斯 (Taos),56英里。
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