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气溶胶的吸收和散射以及地表对太阳辐射的反射，决定了气溶胶存在所引起的行星反照率变化的正负号（增减方向）。这种行星反照率的变化会导致大气变暖或变冷。吸收与散射之比随时间发生微小变化即可逆转这种变暖或变冷的趋势。
Marshall A. Atwater (Fri,) 研究了这一问题。
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