JAn%2014%20%20lecture

JAn%2014%20%20lecture - Understand the meaning of climate...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Understand the meaning of climate and  climate change. Understand basic trends in recent climate  change including temperature,  precipitation, melting ice and snow, and  sea level trends. Understand greenhouse gas emissions  are a major cause of recent climate  change. Identify important greenhouse gases and 
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
The week we will describe: Recent Climate Change:  How has the climate  changed in the last 100-150  years? What has caused the  changes? Future Climate Change : How  might climate change over  the next 100 years and why? Past Climate Change:  What  has caused the Earth's  climate to change throughout  its history? How has it  changed? And: State of Knowledge: What aspects of climate  change do we understand  best? What are the most  significant uncertainties? 
Background image of page 2
Global mean surface  temperature warmed by  between 1.0 and 1.7°F since  1850 (see Figure 1). The Earth’s surface is  currently warming at a rate of  about 0.32ºF/decade or  3.2°F/century. Globally, 11 of the last 12  years are among the 12  warmest on record since  1850. Additionally, average  temperatures in the Arctic  have increased at almost  twice the global rate in the  past 100 years. (IPCC, 2007)
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Increasing temperatures tend to  increase evaporation which  leads to more precipitation ( IPCC, 2007 ).  Precipitation has increased  north of 30°N but has mostly  declined over the tropics since  the 1970s.  It has become significantly  wetter  in eastern parts of North  and South America, northern  Europe, and northern and  central Asia, but drier in the  Sahel, the Mediterranean,  southern Africa and parts of  southern Asia. Increase in heavy precipitation  events over many areas during  the past century, as well as an  increase in the prevalence of  droughts—especially in the  tropics and subtropics.
Background image of page 4
sea ice will continue to  contract. IPCC, 2007
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 23

JAn%2014%20%20lecture - Understand the meaning of climate...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online