Ice Sheets and Climate - download pdf or read online

By Johannes Oerlemans, C.J. van der Veen

ISBN-10: 9400963254

ISBN-13: 9789400963252

ISBN-10: 9400963270

ISBN-13: 9789400963276

Climate modelling is a box in quick improvement, and the fltudy of cryospheric tactics has develop into a huge a part of it. On smaller time scales, the impact of snow disguise and sea ice at the atmospheric movement is of shock for long-range climate forecasting. pondering in a long time or centuries, the impression of a C02 climatic warming at the present-day ice sheets, and the ensuing adjustments in worldwide sea point, has drawn loads of recognition. specifically, the dynamics of marine ice sheets (ice sheets on a mattress that might be under sea point after elimination of ice and whole isostatic rebound) is a topic of constant study. This curiosity stems from the truth that the West Antarctic Ice Sheet is a marine ice sheet which, in line with a few employees, can be on the subject of an entire cave in. The Pleistocene ice a long time, or glacial cycles, are most sensible characterised via overall ice quantity on the earth, indicating that on four five huge time scales (10 to ten 12 months) ice sheets are a dominant component to the weather method. the big volume of paleoclimatic info bought from deep-sea sediments within the previous couple of many years has resulted in a whole revival of iriterest within the actual elements of the Pleistocene climatic evolution.

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Ice Sheets and Climate - download pdf or read online

Weather modelling is a box in swift improvement, and the fltudy of cryospheric tactics has develop into a major a part of it. On smaller time scales, the influence of snow hide and sea ice at the atmospheric circulate is of shock for long-range climate forecasting. pondering in a long time or centuries, the impact of a C02 climatic warming at the present-day ice sheets, and the ensuing alterations in international sea point, has drawn loads of awareness.

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4) generally do this in connection with a separate OERLEMANS & VAN DER VEEN / ICE SHEETS AND CLIMATE 56 treatment of basal sliding. 4), the practical consequences are not very large. Many combinations of m and B, and of n and A, can be found that yield realistic ice-sheet profiles. 4) implies that the effect of normal stresses is neglected. Since normal stresses are important at the ice-sheet edge, building a time-dependent model with the equations discussed above requires a special treatment of the edge of the model ice sheet.

For long waves the latter dominates. When forcing (and dissipation) is introduced the phase of the induced stationary waves depends in a similar way on L as the phase speed does for free waves. We will not prove this, but it is a general result emerging from planetary-wave models of different complexity. Long waves (which can only be generated by a forcing field of very large scale) tend to be shifted in upstream direction, and short waves in downstream direction. Summarizing, the message of this analysis is that the phase (and amplitude, not discussed here) of planetary waves forced by ice sheets depends strongly on the size of the ice sheets.

In the calculation the present situation was assumed to be represented by 8 e = 25 0 C and 8p = -I °C. Situations with a constant water-temperature difference lie on the straight line in the figure. The decrease in turnover time when the average temperature goes up is obvious. Although this diagram gives an impression of how T depends on temperature conditions it does not make clear how ice sheets affect T. 6. Relative turnover time of the deep ocean circulation as a function of polar and equatorial water temperature (8 p and 8 e , respectively).

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Ice Sheets and Climate by Johannes Oerlemans, C.J. van der Veen


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