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P1:初提CD&faint-young-sun paradox
-FYS: sun 25-30% dimmer 4.6billion yrs ago
-Solar luminosity&intensity increased with time
P2:介紹faint-young-sun的paradox
-if atmosphere same—> weak sun result in ice-covered 2 billions yrs ago <—> truth is planet not freeze, liquid water 3.8 billion yrs ago
-life 3.5 billion yrs ago: earth surface never entirely frozen
P3: 提出解釋：大氣改變: 雲的多寡影響溫度
-paradox disappears if assume atmosphere has changed
-fewer clouds—warmer
-early earth warmer- no evidence of similar glaciation before as glacier today
P4:介紹溫室氣體可能可解釋，但又被推翻
-NH3 could have warmed the climate
-Subsequent study: sun convert ammonia to the non greenhouse gas unless it was resupplied
P5:提出CD新解釋
-carbon dioxide-not decompose-abundant
-its greenhouse warming — compensate for the reduced sunlight
P6:CD降速＆太陽光增強要保持平衡
-CD declined at a rate = solar pwr increase: earth’s temp remain within limits
-Hart calculate compensatory rate
P7:Hart展開抵銷計算顯示
-gas decline with time
-few calculation succeeded: composition change at a rate— could become unable to declined
-if CD declines too slowly, earth would have become a hothouse
-if decline too quick—> oceans frozen
P8:Hart計算距離遠近改變對地球環境影響
-calculations: distance between sun&earth
-5% closer—> ocean evaporate
-1% farther—> glaciation
-0.95-1.01AU catastrophes avoid
P9:新model發現Hart理論破綻
-Hart’s conclusion: the earth has beaten many odds —> flaw
-mathematical model: carbon d ↓-temp↑ = negative feedback means the earth never in danger of undergoing runaway greenhouse or glaciation
cosmological 宇宙学的
stellar 恒星的
glaciation 冰川作用
runaway 迅速的;难以控制的
postulate 假定 |
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发表于 2022-10-6 23:43:16
