Antigua and Barbuda. General Climate. Recent Climate Trends. UNDP Climate Change Country Profiles. Temperature
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1 UNDP Climate Change Country Profiles Antigua and Barbuda C. McSweeney 1, M. New 1,2 and G. Lizcano 1 1. School of Geography and Environment, University of Oxford. 2. Tyndall Centre for Climate Change Research General Climate Antigua and Barbuda are located at N, and experience the year round warm, humid conditions associated with the Tropics. Mean temperature in summer months is around 27 C, dropping by only a degree or so to around 25 C in the cooler months of December to February. The wet season occurs through May to October, during which the island receives around mm per month. Inter annual variability in Caribbean climate is influenced strongly the El Niño Southern Oscillation (ENSO). El Niño episodes bring warmer and drier than average conditions during the late wet season and La Niña episodes bring colder and wetter conditions at this time. Antigua and Barbuda also lie in the heart of the Atlantic hurricane belt, where cyclones and hurricanes occur throughout August, September and October. Heavy rainfall associated with cyclones and hurricanes contributes significantly to wet season rainfall totals. The occurrence of hurricanes is strongly linked to ENSO, with more frequent hurricane activity associated with La Niña events, and less frequent events in El Niño years. Recent Climate Trends Temperature Mean annual temperature in Antigua and Barbuda has increased by around 0.6 C since 1960, at an average rate of 0.13 C per decade. There is insufficient daily observational data to identify trends in daily temperature extremes. 1
2 Precipitation Mean rainfall over Antigua and Barbuda has increased significantly since 1960 in all seasons, but most substantially in SON when average increase of 19.0mm per month (11.0%) per decade has occurred. There is insufficient available daily rainfall data for Antigua and Barbuda to determine trends in daily rainfall extremes. GCM Projections of Future Climate Temperature The mean annual temperature is projected to increase by 0.4 to 2.1 C by the 2060s, and 0.9 to 3.5 degrees by the 2090s. The range of projections by the 2090s under any one emissions scenario is around 1 2 C. The projected rate of warming is similar throughout the year, but a little more rapid in the colder seasons DJF and SON. All projections indicate substantial increases in the frequency of days and nights that are considered hot 1 in current climate. o Annually, projections indicate that hot days will occur on 25 64% of days by the 2060s, and 36 99% of days by the 2090s. Days that are hot for each season are projected to increase most rapidly in SON, occurring on % of nights in every season by the 2090s. o Nights that are considered hot for the annual climate of are projected to occur on 24 63% of nights by the 2060s and 37 99% of nights by the 2090s. Nights that are hot for each season are projected to increase most rapidly in SON, occurring on % of nights in every season by the 2090s. Days and nights that are considered cold 2 in current climate do not occur at all in projections from any model, under any emissions scenario by the 2090s, and only occur under the lowest emissions scenario by the 2060s. Precipitation Projections of mean annual rainfall from different models in the ensemble are broadly consistent in indicating decreases in rainfall for Antigua and Barbuda. The largest decreases are projected for JJA, with changes varying from 66% to +22% by the 2090s. Ensemble median changes for all seasons are negative. Annual projections vary between 44% to +26% by the 2090s with ensemble median changes of 6 to 16%. The proportion of total rainfall that falls in heavy 3 events decreases in most model projections, changing by 19% to +10% by the 2090s. 1 Hot day or hot night is defined by the temperature exceeded on 10% of days or nights in current climate of that region and season. 2 Cold days or cold nights are defined as the temperature below which 10% of days or nights are recorded in current climate of that region or season. 2
3 Maximum 1 and 5 day rainfalls tend to decrease in model projections, with 5 day maxima changing by 16 to +12mm by the 2090s. Additional Regional Climate Change Information Tropical cyclones are poorly captured by GCMs and thus potential changes in intensity and tracks of tropical cyclones in the future are very uncertain. Whilst evidence indicates that tropical cyclones are likely to become, on the whole, more intense under a warmer climate as a result of higher sea surface temperatures, there is great uncertainty in changes in frequency, and changes to storm tracks and their interactions with other features of climate variability (such as the El Niño Southern Oscillation) which introduces uncertainty at the regional scale (Christensen et al., 2007). The uncertainty in potential changes in tropical cyclone contributes to uncertainties in future wet season rainfall. Potential increases in summer rainfall associated with tropical cyclone activity, which may not be captured in the GCM projections, may counteract the projected decreases in rainfall in the region (Christensen et al., 2007). Model simulations show wide disagreements in projected changes in the amplitude of future El Niño events, contributing to uncertainty in future climate variability in projections for this region. The Caribbean islands are vulnerable to sea level rise. Sea level in this region is projected by climate models to rise by the following levels 4 by the 2090s, relative to sea level: o 0.13 to 0.43m under SRES B1 o 0.16 to 0.53m under SRES A1B o 0.18 to 0.56m under SRES A2 For further information see Christensen et al. (2007) IPCC Working Group I Report: The Physical Science Basis, Chapter 11 (Regional Climate projections): Sections 11.6 (South and Central America), and 11.9 (Small Islands). 3 A Heavy event is defined as a daily rainfall total which exceeds the threshold that is exceeded on 5% of rainy days in current the climate of that region and season. 4 Taken from the IPCC Working group I (The Physical Science Basis): Chapter 10 (Global Climate Projections) (Meehl et al., 2007). Regional sea level projections are estimated by applying regional adjustments (Fig 10.32, p813) to projected global mean sea level rise from 14 AR4 models. 3
4 Data Summary Observed Mean Observed Trend Projected changes by the 2030s Projected changes by the 2060s Projected changes by the 2090s Min Median Max Min Median Max Min Median Max ( C) (change in C per decade) Temperature Change in C Change in C Change in C A Annual * A1B B A DJF * A1B B A MAM * A1B B A JJA * A1B B A SON * A1B B Precipitation (mm per month) (change in mm per decade) Change in mm per month Change in mm per month Change in mm per month A Annual * A1B B A DJF * A1B B A MAM * A1B B A JJA * A1B B A SON * A1B B Precipitation (%) (mm per month) (change in % per decade) % Change % Change % Change A Annual * A1B B A DJF * A1B B A MAM * A1B B A JJA * A1B B A SON * A1B B
5 Observed Mean Observed Trend Projected changes by the 2030s Projected changes by the 2060s Projected changes by the 2090s Min Median Max Min Median Max Min Median Max % Frequency Change in frequency per decade Future % frequency Future % frequency Frequency of Hot Days (TX90p) A2 **** **** **** Annual **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** DJF **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** MAM **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** JJA **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** SON **** **** A1B **** **** **** B1 **** **** **** Frequency of Hot Nights (TN90p) A2 **** **** **** Annual **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** DJF **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** MAM **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** JJA **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** SON **** **** A1B **** **** **** B1 **** **** **** Frequency of Cold Days (TX10p) A2 **** **** **** Annual **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** DJF **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** MAM **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** JJA **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** SON **** **** A1B **** **** **** B1 **** **** **** Frequency of Cold Nights (TN10p) A2 **** **** **** Annual **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** DJF **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** MAM **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** JJA **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** SON **** **** A1B **** **** **** B1 **** **** ****
6 Observed Mean Observed Trend Projected changes by the 2030s Projected changes by the 2060s Projected changes by the 2090s Min Median Max Min Median Max Min Median Max % total rainfall falling in Heavy Events (R95pct) % Change in % per decade Change in % Change in % A2 **** **** **** Annual **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** DJF **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** MAM **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** JJA **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** SON **** **** A1B **** **** **** B1 **** **** **** Maximum 1 day rainfall (RX1day) mm Change in mm per decade Change in mm Change in mm A2 **** **** **** Annual **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** DJF **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** MAM **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** JJA **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** SON **** **** A1B **** **** **** B1 **** **** **** Maximum 5 day Rainfall (RX5day) mm Change in mm per decade Change in mm Change in mm A2 **** **** **** Annual **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** DJF **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** MAM **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** JJA **** **** A1B **** **** **** B1 **** **** **** A2 **** **** **** SON **** **** A1B **** **** **** B1 **** **** ****
7 Figure 1: Trends in annual and seasonal mean temperature for the recent past and projected future. All values shown are anomalies, relative to the mean climate. Black curves show the mean of observed data from 1960 to 2006, Brown curves show the median (solid line) and range (shading) of model simulations of recent climate across an ensemble of 15 models. Coloured lines from 2006 onwards show the median (solid line) and range (shading) of the ensemble projections of climate under three emissions scenarios. Coloured bars on the right-hand side of the projections summarise the range of mean climates simulated by the 15 models for each emissions scenario. 7
8 Figure 2: Spatial patterns of projected change in mean annual and seasonal temperature for 10-year periods in the future under the SRES A2 scenario. All values are anomalies relative to the mean climate of In each grid box, the central value gives the ensemble median and the values in the upper and lower corners give the ensemble maximum and minimum. 8
9 Figure 3: Trends in monthly precipitation for the recent past and projected future. All values shown are anomalies, relative to the mean climate. See Figure 1 for details. 9
10 Figure 4: Spatial patterns of projected change in monthly precipitation for 10-year periods in the future under the SRES A2 scenario. All values are anomalies relative to the mean climate of See Figure 2 for details. 10
11 Figure 5: Trends in monthly precipitation for the recent past and projected future. All values shown are percentage anomalies, relative to the mean climate. See Figure 1 for details. 11
12 Figure 6: Spatial patterns of projected change in monthly precipitation for 10-year periods in the future under the SRES A2 scenario. All values are percentage anomalies relative to the mean climate of See Figure 2 for details. 12
13 Figure 7: Trends in Hot-day frequency for the recent past and projected future. See Figure 1 for details. 13
14 Figure 8: Spatial patterns of projected change in Hot-day frequency for 10-year periods in the future under the SRES A2 scenario. See Figure 2 for details. 14
15 Figure 9: Trends in hot-night frequency for the recent past and projected future. See Figure 1 for details. 15
16 Figure 10: Spatial patterns of projected change in hot-night frequency for 10-year periods in the future under the SRES A2 scenario. See Figure 2 for details. 16
17 Figure 11: Trends in cold-day frequency for the recent past and projected future. See Figure 1 for details. 17
18 Figure 12: Spatial patterns of projected change in cold-day frequency for 10-year periods in the future under the SRES A2 scenario. See Figure 2 for details. 18
19 Figure 13: Trends in cold-night frequency for the recent past and projected future. See Figure 1 for details. 19
20 Figure 14: Spatial patterns of projected change in cold-night frequency for 10-year periods in the future under the SRES A2 scenario. See Figure 2 for details. 20
21 Figure 15: Trends in the proportion of precipitation falling in heavy events for the recent past and projected future. All values shown are anomalies, relative to the mean climate. See Figure 1 for details. 21
22 Figure 16: Spatial patterns of projected change in the proportion of precipitation falling in heavy events for 10-year periods in the future under the SRES A2 scenario. All values are anomalies relative to the mean climate of See Figure 2 for details. 22
23 Figure 17: Trends in maximum 1-day rainfall for the recent past and projected future. All values shown are anomalies, relative to the mean climate. See Figure 1 for details. 23
24 Figure 18: Spatial patterns of maximum 1-day rainfall for 10-year periods in the future under the SRES A2 scenario. All values are anomalies relative to the mean climate of See Figure 2 for details. 24
25 Figure 19: Trends in maximum 5-day rainfall for the recent past and projected future. All values shown are anomalies, relative to the mean climate. See Figure 1 for details. 25
26 Figure 20: Spatial patterns of projected change in maximum 5-day rainfall for 10-year periods in the future under the SRES A2 scenario. All values are anomalies relative to the mean climate of See Figure 2 for details. 26
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