Drought in the sahara: insufficient biogeophysical feedback?
نویسنده
چکیده
5 C K H u n n ~ r f o r dJ U'ilill M a ~ ~ a n e n ~ e n i latitudinal averages obscure pertinent spa28. 141 ( 1964). I. I . I . LlcMillan. J. W~idl . .Mana,cement 28. 702 6, R , ,4, ~ l J , E~,rp,~ h ~~25 (197 1). ~ 1 , , tial and temporal variationi. Although the ~ ~ ~1 7 . (1964) 7. H . W. Bcnnetts. C . J . Cndcruood , F.. I Shier. precipitation pattern depends most 2. W. .I. F ranc~s , ibid 34. 749 (1970). Au.si. k'ei. J. 22, 2 (1946).
منابع مشابه
Drought in the sahara: a biogeophysical feedback mechanism.
Two integrations of a global general circulation model, differing only in the prescribed surface albedo in the Sahara, show that an increase in albedo resulting from a decrease in plant cover causes a decrease in rainfall. Thus any tendency for plant cover to decrease would be reinforced by a decrease in rainfall, and could initiate or perpetuate a drought.
متن کاملComment on "Climate-driven ecosystem succession in the Sahara: the past 6000 years".
Kröpelin et al. (Research Articles, 9 May 2008, p. 765) interpreted a sediment record from Lake Yoa in the east-central part of North Africa as support for a weak biogeophysical climate-vegetation feedback in the Sahara during the mid-Holocene. We argue that the new data do not invalidate earlier modeling results on strong land-atmosphere coupling in the Western Sahara for which the Lake Yoa re...
متن کاملQuantification of Land-Atmosphere Coupling and Implications for Drought Persistence In Observations and Model Simulations of 20th Century Climate and 21st Century Climate Change
Of all recurring natural disasters, long-term drought is one of the most devastating and costly due to large spatial extent and often long duration. The mechanisms responsible for the maintenance of long-term droughts are not well understood, however many drought analyses allege the importance of land-atmosphere feedbacks and speculate that these feedbacks will amplify changes in the hydrologic...
متن کاملThe role of ecosystem-atmosphere interactions in simulated Amazonian precipitation decrease and forest dieback under global climate warming
A suite of simulations with the HadCM3LC coupled climate-carbon cycle model is used to examine the various forcings and feedbacks involved in the simulated precipitation decrease and forest dieback. Rising atmospheric CO2 is found to contribute 20% to the precipitation reduction through the physiological forcing of stomatal closure, with 80% of the reduction being seen when stomatal closure was...
متن کاملNatural and anthropogenic climate change: incorporating historical land cover change, vegetation dynamics and the global carbon cycle
This study explores natural and anthropogenic influences on the climate system, with an emphasis on the biogeophysical and biogeochemical effects of historical land cover change. The biogeophysical effect of land cover change is first subjected to a detailed sensitivity analysis in the context of the UVic Earth System Climate Model, a global climate model of intermediate complexity. Results sho...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Science
دوره 191 4222 شماره
صفحات -
تاریخ انتشار 1976