Based on the study of oxygen isotope and mi-croparticle in the Guliya ice core, atmospheric dust and en-vironmental changes in the northwest Tibetan Plateau since the last interglacial were revealed. The microparticle...Based on the study of oxygen isotope and mi-croparticle in the Guliya ice core, atmospheric dust and en-vironmental changes in the northwest Tibetan Plateau since the last interglacial were revealed. The microparticle record indicates that low dust load on the Plateau in the interglacial. Particle concentration increased rapidly when the climate turned into the last glacial and reached the maximum during the MIS 4. In the Last Glacial Maximum, however, the en-hancement of microparticle concentration was slight, differ-ing to those in the Antarctic and Greenland. On the orbital timescale, both the temperature on the Tibetan Plateau and summer solar insolation in the Northern Hemisphere had their impact on the microparticle record, but the difference in phase and amplitude also existed. Though having the same dust source, microparticle records in the ice cores on the Tibetan Plateau and the Greenland seem to have different significance.展开更多
By the analyses of Guliya ice core on the Ti-betan Plateau, it was found that the calcium (Ca2+) origi-nated from the terrestrial source is the main cation of soluble aerosol and a good proxy of the atmospheric compon...By the analyses of Guliya ice core on the Ti-betan Plateau, it was found that the calcium (Ca2+) origi-nated from the terrestrial source is the main cation of soluble aerosol and a good proxy of the atmospheric component and environment in the mountain ice core located in the mid-low latitude arid regions. Evident variation of Ca2+ concentration has been found in the Guliya ice core since the Last Intergla-ciation with two relatively strong increase periods and two weak increase periods. These variations are generally related to climatic changes: high Ca2+ concentration periods coincide with cold periods and low Ca2+ concentration periods coin-cide with warm periods. However, Ca2+ concentration does not always decrease (increase) with climate warming (cool-ing). The magnitude and phase of Ca2+ concentration does not always match temperature either. The changes of at-mospheric circulation, land surface condition and atmos-pheric humidity might be important factors which influence Ca2+ concentration besides temperature.展开更多
文摘Based on the study of oxygen isotope and mi-croparticle in the Guliya ice core, atmospheric dust and en-vironmental changes in the northwest Tibetan Plateau since the last interglacial were revealed. The microparticle record indicates that low dust load on the Plateau in the interglacial. Particle concentration increased rapidly when the climate turned into the last glacial and reached the maximum during the MIS 4. In the Last Glacial Maximum, however, the en-hancement of microparticle concentration was slight, differ-ing to those in the Antarctic and Greenland. On the orbital timescale, both the temperature on the Tibetan Plateau and summer solar insolation in the Northern Hemisphere had their impact on the microparticle record, but the difference in phase and amplitude also existed. Though having the same dust source, microparticle records in the ice cores on the Tibetan Plateau and the Greenland seem to have different significance.
文摘By the analyses of Guliya ice core on the Ti-betan Plateau, it was found that the calcium (Ca2+) origi-nated from the terrestrial source is the main cation of soluble aerosol and a good proxy of the atmospheric component and environment in the mountain ice core located in the mid-low latitude arid regions. Evident variation of Ca2+ concentration has been found in the Guliya ice core since the Last Intergla-ciation with two relatively strong increase periods and two weak increase periods. These variations are generally related to climatic changes: high Ca2+ concentration periods coincide with cold periods and low Ca2+ concentration periods coin-cide with warm periods. However, Ca2+ concentration does not always decrease (increase) with climate warming (cool-ing). The magnitude and phase of Ca2+ concentration does not always match temperature either. The changes of at-mospheric circulation, land surface condition and atmos-pheric humidity might be important factors which influence Ca2+ concentration besides temperature.
