1 A changing climate leads to changes in extreme weather and climate events the focus of Chapter 3 Presented by: David R. Easterling
2 Chapter 3:Changes in Climate Extremes & their Impacts on the Natural Physical Environment Coordinating Lead Authors: Sonia Seneviratne (Switzerland), Neville Nicholls (Australia) Lead Authors: David Easterling (USA), Clare Goodess (UK), Shinjiro Kanae (Japan), James Kossin (USA), Yali Luo (China), Jose Marengo (Brazil), Kathleen McInnes (Australia), Mohammad Rahimi (Iran), Markus Reichstein (Germany), Asgeir Sorteberg (Norway), Carolina Vera (Argentina), Xuebin Zhang (Canada)
3 Overview of SREX Chapter 3 Complexities: variety of extremes, definitional issues, different measures, scale issues Applied new uncertainty guidance throughout (confidence and likelihood). More than 50 assessments using uncertainty terms (e.g., very likely, medium confidence ) in Chapter 3 Executive Summary Most of these are consistent with AR4, but there are a few revisions; one-to-one comparison is not possible (change in uncertainty guidance, differences in aspects being assessed, ) Provided regional assessments of changes in extremes of temperature, heavy precipitation, drought in tables and figures Tried to balance needs of policymakers for regional projections, with the need for scientific credibility >5 000 comments on chapter 3 material; ~4 600 CLA-CLA s
4 SREX Chapter 3: Contents Executive Summary 3.1. Weather and Climate Events Related to Disasters 3.2. Requirements and Methods for Analyzing Changes in Extremes 3.3. Observed and Projected Changes of Weather and Climate Extremes 3.4. Observed and Projected Changes in Phenomena Related to Weather and Climate Extremes 3.5. Observed and Projected Impacts on the Natural Physical Environment FAQ 3.1: Is the Climate Becoming More Extreme? FAQ 3.2: Has Climate Change Affected Individual Extreme Events? Regional Tables for observed and projected changes.
5 Progress regarding extremes since AR4 More literature ~ 900 references in Chapter 3 ~ 75% of these published since AR4 More observations & further study of quality of observations (tropical cyclones, drought measures) New attribution studies Floods; heat waves; heavy rainfall Closer study of model projections Extensive study of droughts More studies; definition issues
6 Key messages observed changes Very likely increase in warm days and nights & decrease in cold days and nights on global scale Likely that more regions have experienced increases than decreases in heavy precipitation events Likely that there has been an increase in extreme coastal high water related to increases in mean sea level Low confidence in any observed long-term (i.e., 40 years or more) increases in tropical cyclone activity Medium confidence that some regions of the world have experienced more intense and longer droughts, but in some regions droughts have become less frequent, less intense, or shorter
7 Key messages projected changes Virtually certain that increases in the frequency and magnitude of warm daily temperature extremes and decreases in cold extremes will occur Likely that the frequency of heavy precipitation or the proportion of total rainfall from heavy falls will increase over many areas Medium confidence that droughts will intensify in some seasons and areas Very likely that mean sea level rise will contribute to upward trends in extreme coastal high water levels Average tropical cyclone maximum wind speed is likely to increase, although increases may not occur in all ocean basins. It is likely that the global frequency of tropical cyclones will either decrease or remain essentially unchanged
8 SREX: Regional Observed and Projected Changes Large-scale, land only, regions used for temperature & precipitation extremes:
9 All Africa Observed changes in Warm Days and Nights, and Cold Days and Nights since 1950 Low confidence to Medium confidence: Low confidence due to insufficient evidence for all Africa. Medium confidence in increase in frequency of WD and decrease in frequency of CD in southern part of continent and increase in frequency of WN in northern and southern part of continent. Medium confidence in decrease in frequency of CN in southern part of continent
10 All Africa Observed changes in Heatwaves/Warm Spells since 1950 Low confidence: insufficient evidence, some analyses in localized regions. Observed Changes in Heavy Precipitation Since 1950 Low confidence: - Partial lack of data and literature and inconsistent patterns in existing studies
11 All Africa Observed changes in Dryness since 1950 Medium confidence: Overall increase in dryness (SMA, PDSI); much regional variability, 1970s prolonged Sahel drought dominates. No apparent continent-wide trends in change in rainfall over the 20th century. Wet season arrives 9 21 days later, large interannual variability of wet season start, local scale geographical variability
12 East Africa Observed changes in Warm Days and Nights, and Cold Days and Nights since 1950 Warm Days, Cold Days: Low confidence: Lack of evidence due to lack of literature and spatially nonuniform trends. Over time period spatially non-uniform trends in daytime temperature, some areas with cooling. In southern tip of domain increases in WD, decreases in CD Warm Nights, Cold Nights: Medium confidence: Over time period , spatially non-uniform trends, rise of nighttime temperature at several locations, but with many coastal areas and stations near large water bodies showing a significant decrease. In southern tip of domain, decreases in CN, increases in WN.
13 East Africa Observed changes in Heatwaves, Heavy Precipitation and Dryness since 1950 Heatwave/Warm Spells: Low confidence: Insufficient evidence (lack of literature) for most of region; increase in WSDI in southern tip of domain (New et al., 2006). Heavy Precipitation: Low confidence: Insufficient evidence (lack of literature) to assess trends. Dryness: Low confidence: Spatially varying trends in dryness (SMA, PDSI) (Sheffield and Wood, 2008a; Dai, 2011).
14 All Africa Projected Changes in Warm Days and Nights, Cold Days and Nights Warm and Cold Days: High confidence: WD likely to increase and CD likely to decrease in all regions Warm Days: Medium confidence: Increase in WD largest in summer and fall. Warm and Cold Nights: High confidence: WN likely to increase and CN likely to decrease.
15 All Africa Projected Changes in Heat Waves, Heavy Precipitation, Dryness Heat Waves: High confidence: Likely more frequent and/or longer heat waves and warm spells Heavy Precipitation Low confidence to High confidence depending on region: Inconsistent change or no signal in HP indicators across much of continent Strongest and most consistent signal is likely increase in HP in E. Africa. Dryness: Low confidence to Medium confidence depending on region: Low confidence in most regions, Medium confidence of increase in dryness (CDD, SMA) in southern Africa except eastern part.
16 Projected return periods for a daily precipitation event that was exceeded in the late 20 th century on average once during a 20-year period. This event happens more like every 10 years (or even more frequently) by the end of the 21 st century in all African regions except Sahara and N. Africa, depending on which emissions scenario is followed.
17 Summary and conclusions SREX: Significantly expanded information compared to AR4 in particular on regional scale Level of certainty in projection strongly depends on the considered extreme, region and season Both adaptation and mitigation are required to reduce impacts: Need to be considered jointly
18 Also assessed changes in phenomena related to weather & climate extremes, and impacts on physical environment: Monsoons Low confidence in observed trends and their attribution due to insufficient evidence Low confidence in projected changes due to insufficient agreement between climate models Tropical cyclones (typhoons) Low confidence that any observed long-term (i.e., 40 years or more) increases in tropical cyclone activity are robust, after accounting for past changes in observing capabilities Low confidence in attribution of any detectable changes to anthropogenic influences Likely decrease or no change in frequency of tropical cyclones (projections) Likely increase in mean maximum wind speed, but possibly not in all basins (projections) Likely increase in heavy rainfall associated with tropical cyclones (projections) Extreme sea level and coastal impacts Likely increase in extreme coastal high water worldwide related to increases in mean sea level in the late 20 th century Likely anthropogenic influence on observed changes via mean sea level contributions Very likely that mean sea level rise will contribute to upward trends in extreme coastal high water levels High confidence that locations currently experiencing coastal erosion and inundation will continue to do so due to increasing sea level, in the absence of changes in other contributing factors See Table 3.1. Very likely = % probability.
3 Changes in Climate Extremes and their Impacts on the Natural Physical Environment Coordinating Lead Authors: Sonia I. Seneviratne (Switzerland), Neville Nicholls (Australia) Lead Authors: David Easterling
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