Ohio Weather & Climate Trends
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1 Ohio Weather & Climate Trends Jeffrey C. Rogers Department of Geography and Atmospheric Science Program State Climate Office for Ohio The Ohio State University February 6, 2013 Soil Water Conservation Service
2 Today s Talk What is changing in Ohio s climate. Will show that climate extremes are becoming more frequent and that some, but not all, of our Ohio climate trends are falling in line with those expected due to greenhouse gas forcing of climate.
3 What can we expect with climate change? biggest impacts of global warming will come in the form of changes in weather and climate extremes. More heat waves Drought more frequent & severe in some regions Precipitation will be less frequent but more intense, high rainfall events more common.
4 Air Temperature Changes Air temperature is affected by Greenhouse gases, carbon dioxide, methane and others. Air temperature increases with time as these gases increase in concentration in the atmosphere.
5 Humidity Changes: Evaporation into the air is a function of air Temperature Humidity Under 100% As air temperature goes up the amount of water evaporated from Earth goes up Implications of increased humidity content: Precipitation changes, atmospheric stability and severe weather frequency
6 Evaporation of Water Evaporated water is a greenhouse gas, like CO 2, that becomes warmer as it absorbs infrared radiation from earth s surface trying to escape to space.
7 Earth with Greenhouse Gases With Greenhouse gases (CO 2 and H 2 O vapor) the planet s average temperature fluctuates around +59ºF. This is 58ºF warmer than with no greenhouse gases 39F of warming is contributed by H 2 O vapor, 19F of warming by CO 2
8 +3.14" /century -0.18"/Century With more evaporation, more precipitation? Ohio trends " /century +0.67" /century "/century Increasing precipitation in every season but winter. Net annual increase of 3.14 inches per century. 2011: wettest year on record.
9 Ohio precipitation could increase 5-15% in winter & spring, decline 10% in summer by
10 Current differences in Ohio Precipitation relative to end of century predictions: Spring is becoming wetter but so are summer and autumn. Winter is not becoming wetter. Currently: rain increasing in seasons having more evaporation. Why? One constant in Ohio s climate is storminess. Weather fronts and cyclones appear to be unfailingly bringing us local moisture (and humidity from other places) and lifting it to form clouds and precipitation.
11 Example from 2011 Storm Track
12 Extremes in precipitation are also up: Ohio One Inch Rain Days per Year Dayton: 6 days Columbus: 4.5 days Cleveland: under 4 days 2000 s Dayton: Over 9 days Columbus: ~ 8 days Cleveland: ~ 7 days
13 Why will drought and flooding both become more common? Drought: With higher temperatures, air can take in more moisture and ground generally dries out as soil water evaporates into the air. Flooding: Humid air will return to the ground as above normal rainfall in areas favored by weather fronts, cyclones, and thunderstorm complexes.
14 +1.29F/century +0.91F/century Ohio Temperature time trends F/century +0.28F/century -Warming in all seasons -Largest warming in spring - Spring 2012: warmest on record. -Large annual temperature trend is up over 2 F since 1960s +0.27F/century
15 Springtime Warming In Columbus, OH: January 1- April 30: 28 of 120 days have set new record high temperatures since 2000 March 17 and April 19 (34 days), 15 days have record maxima set since Similar data for Cleveland and Cincinnati. No new record lows in those 34 days. 43 new record highs over all 12 months.
16 Ohio: Spring Heat Wave Consequences Early warm period in March 22-28, 2007 (70s & 80s F) was followed by a prolonged hard freeze from April 4-10, lows in the 20 s. Impacts Forage: alfalfa and grass hay in southern Ohio were substantially reduced or delayed 2007 apple crop wiped out in southern OH Bramble: black- & raspberries largely lost in southern OH
17 Spring warmth 2012 Temperatures in 70s and 80s March Record highs in mid-80s 20 th, 21 st, 22 nd. April: subfreezing statewide from 5 th -7 th and 11 th -12 th. Losses statewide and in the Midwest to apples and strawberries as well as other berries, peaches and grapes. April/May cold waves will kill crops but do not set record low temperatures.
18 Few record high temperatures in Ohio are occurring in summer. Instead: overnight lows are increasing. Why: Increasing humidity (evaporated moisture) Humidity suppresses maximum temperatures in the summer but, as a greenhouse gas, keeps overnight temperatures high. Humidity is not as high in winter and spring, so record highs are being set with global warming.
19 Differing Summer Daytime and Nighttime Temperature Changes Across Ohio and the Midwest, Daytime: little change Overnight lows increasing dramatically. Humidity and dew point temperatures are going up.
20 Impacts of increasing nighttime minimum summer temperatures Latitudinal shifts in agro-climatic zones Introduction of new agricultural pests, pathogens and fungi Corn nighttime respiration changes which shorten time to maturity and decrease corn yields Yield reductions reported in other crops such as rice.
21 Overall Summary (1) Ohio is becoming warmer and wetter with time and summers/growing seasons are more humid. High rainfall events are more common in Ohio Record high temperatures in spring Precipitation is increasing across Ohio, over 3 inches in the last century, especially in the non-winter (more humid) seasons. Current data suggest that as long as storms and fronts keep active in Ohio, our climate may not dry out during most growing seasons.
22 Overall Summary (2) Spring is a season of agricultural peril: increasing rain and temperatures, especially record highs, while cold waves can still kill plants in April and May. Seasonally: Low humidity January-April = record high temperatures High humidity in summer = warm nights
23 Thank You!
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