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Extra resources for IAQ Tools for Schools: Managing Asthma in the School Environment (2005)
Since 11,270 years ago there has been a more stable climate but with some abrupt changes. For example, in recent times, four large-scale droughts ranging from 2 to 10 years have occurred since the 17th century in the Indian Ocean region (Cook et al. 2010). Temperature changes in the tropics are usually a little more than one half of those changes recorded at the poles but have strong effects on monsoon circulation strength and associated rainfall (Correge et al. 2004). Climate Change and Oceanography Between 11,000 and 5,000 years ago, east Africa was warmer and wetter than at present, despite some short-term but significant temperature changes.
2003). Based on coral cores located throughout the Indian Ocean and a time series starting in ad 1660, Gong and Luterbacher (2008) determined that the cross-equatorial winds and monsoons were strongest in the late 17th to late 19th century and have weakened in the 20th century. Additionally, decreasing dust concentrations in Tibetan Plateau snow in the past 50 years indicate reduced winds over Tibet (Xu et al. 2007). The loss of extensive forests 1,400 years ago in China (Dearing et al. 2008), 400 years ago in India (Caner et al.
Since 2000, the spatial resolution has increased to 4 × 4 km. This higher resolution is good for many purposes, but the longer time scales are critical for separating oceanographic oscillations from longer trends, such as human-induced global warming, where the signal is most observable from the mid-1970s (Ihara et al. 2008). Surface ocean temperature data for the past 120 years in the Indian Ocean show the rising temperatures that characterize many of the world’s oceans and specifically the increasing strength of warm oceanographic oscillations 25 Adapting to a Changing Environment from the 1980s (Fig.
IAQ Tools for Schools: Managing Asthma in the School Environment (2005) by U.S. Environmental Protection Agency (EPA) Contributors