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Other possible dangers caused by global dimming

Relationship to hydrological cycle

This figure shows the level of agreement between a climate model driven by five factors and the historical temperature record. The negative component identified as "sulfate" is associated with the aerosol emissions blamed for global dimming.

Pollution produced by humans may be seriously weakening the Earth's water cycle — reducing rainfall and threatening fresh water supplies. A 2001 study by researchers at the Scripps Institution of Oceanography suggests that tiny particles of soot and other pollutants have a significant effect on the hydrological cycle. According to Professor V. Ramanathan: "The energy for the hydrological cycle comes from sunlight. As sunlight heats the ocean, water escapes into the atmosphere and falls out as rain. So as aerosols cut down sunlight by large amounts, they may be spinning down the hydrological cycle of the planet."[37]

Large scale changes in weather patterns may also have been caused by global dimming. Climate models speculatively suggest that this reduction in sunshine at the surface may have led to the failure of the monsoon in sub-Saharan Africa during the 1970s and 1980s, together with the associated famines such as the Sahel drought, caused by Northern hemisphere pollution cooling the Atlantic.[38] Because of this, the Tropical rain belt may not have risen to its northern latitudes, thus causing an absence of seasonal rains. This claim is not universally accepted and is very difficult to test.

It is also concluded that the imbalance between global dimming and global warming at the surface leads to weaker turbulent heat fluxes to the atmosphere. This means globally reduced evaporation and hence precipitation occur in a dimmer and warmer world, which could ultimately lead to a more humid atmosphere in which it rains less.[39]

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  • 1 decade ago
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    全球性黯淡造成的其他可能的危險對水文學週期的關係 這個圖顯示協議的水平在五個因素駕駛的氣候模型和歷史溫度紀錄之間的。 作為"被辨認的消極組分; sulfate" 同由於全球性黯淡責備的濕劑放射联系在一起。 汙染由人生產了也許嚴重減弱Earth' s水週期-減少降雨量和威脅淡水供應。 由研究員的一項2001研究海洋學的Scripps機關的建議煤灰和其他汙染物微粒子有對水文學週期的重大作用。 根據V. Ramanathan教授: " 水文學週期的能量來自陽光。 因為陽光加熱海洋,水逃脫入大氣並且掉下來作為雨。 至於濕劑由巨额裁減了陽光,他們也許轉動在planet."下的水文學週期; [37] 在气候类型上的大规模变化也許由全球性黯淡也造成。 氣候模型投機地建議在20世紀70年代和20世紀80年代期間,對陽光的這減少在表面也許导致了季風的失敗在撒哈拉以南非洲,與伴生的飢荒一起例如薩赫爾天旱,造成由冷卻大西洋的北半球汙染。[38]因此,熱帶雨傳送帶可能不上升了到它的北緯度,因而導致缺乏季節性雨。 這個要求普遍地沒有被接受並且是非常难測試。 也結束在全球性黯淡和全球性变暖的不平衡狀態在表面之間导致更加微弱的動盪热流大氣。 這意味着全球性地減少的蒸發並且降雨雪在一個更加昏暗和更加溫暖的世界發生,可能終於导致更加潮濕的大氣下雨。[39]

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