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West African Monsoon Region of Analysis
Total West African Monsoon Region of analysis: 15o W – 10o E, 5o N – 20o N
Sub-Sahel Region of analysis: 15o W – 10o E, 7.5o N – 15o N
Coastal Region of analysis: 15o W – 10o E, 5o N – 7.5o N
Precipitation Patterns
Precipitation intensity (mm/day), averaged over 15o W – 10o E (WAM)
Sub-Sahel
Coastal
Inter-annual Precipitation
trmm data
merra
Precipitation intensity (mm/day), averaged monthly over : 15o W – 10o E, and 5o N – 20o N (WAM) 15o W – 10o E, and 7.5o N – 15o N (Sahel Area) 15o W – 10o E, and 5o N – 7.5o N (Coastal Area)
era-interim
gpcp
Inter-annual Precipitation
Precipitation intensity (mm/day), averaged monthly over 15o W – 10o E, and 5o N – 20o N (WAM), for the years 1999 – 2005.
Precipitation intensity (mm/day), averaged over summer months, over 15o W – 10o E, and 5o N – 20o N (WAM), for the years 1999 – 2005.
trmm data merra era-interim
Inter-annual Precipitation Trends
trmm data merra era-interim
May
June
gpcp
test
July
August
September
May-June
July-September
Precipitation intensity (mm/day), averaged yearly over : 15o W – 10o E, and 5o N – 20o N (WAM) 15o W – 10o E, and 7.5o N – 15o N (Sub-Sahel Area) 15o W – 10o E, and 5o N – 7.5o N (Coastal Area)
for the years 1998 – 2007 for trmm, 1999 – 2005 for merra and era-interim, and 1997 – 2007 for gpcp.
May-September
TRMM Regional Precipitation 1999 (maximum rainfall) 2005 (minimum rainfall) Difference (1999-2005)
Spring:
Spring (April-May-June) and summer (July-August-September) precipitation (and their difference) averaged over the WAM
Summer:
TRMM Regional Precipitation
1999 2000 2001 2002
Spring (April-May-June) and summer (July-August-September) precipitation averaged over the WAM
Summer:
Spring:
TRMM Regional Precipitation
2003 2004 2005
Spring (April-May-June) and summer (July-August-September) precipitation averaged over the WAM
Summer:
Spring:
Merra Precipitation & Associated Winds 1999 (maximum rainfall) 2000 (minimum rainfall) Difference (1999 – 2000)
Spring:
Spring (April-May-June) and summer (July-August-September) precipitation and winds at 925 hPa and 700 hPa, (and their difference) averaged over the WAM
Summer:
Test page
Era-Interim Precipitation & Associated Winds 1999 (maximum rainfall) 2002 (minimum rainfall) Difference (1999 – 2002)
Spring:
Spring (April-May-June) and summer (July-August-September) precipitation and winds at 925 hPa and 700 hPa, (and their difference) averaged over the WAM
Summer:
Inter-annual Relative Humidity
Vertically averaged relative humidity, averaged monthly over 15o W – 10o E, and 5o N – 20o N (WAM), for the years 1999 – 2005.
Vertically averaged relative humidity, averaged over summer months, over 15o W – 10o E, and 5o N – 20o N (WAM), for the years 1999 – 2005.
merra era-interim
Merra Relative Humidity & Associated Winds 1999 (maximum precipitation) 2000 (minimum precipitation) Difference (1999 – 2000)
Spring:
Spring (April-May-June) and summer (July-August-September) vertically averaged relative humidity and winds at 925 hPa and 700 hPa (and their difference), averaged over the WAM
Summer:
Era-Interim Relative Humidity & Associated Winds 1999 (maximum precipitation) 2002 (minimum precipitation) Difference (1999 – 2002)
Spring:
Spring (April-May-June) and summer (July-August-September) vertically averaged relative humidity and winds at 925 hPa and 700 hPa (and their difference), averaged over the WAM
Summer:
1999 (maximum precipitation) 2000 (minimum precipitation) Difference (1999 – 2000)
Merra Relative Humidity & Meridional-Vertical Circulation
Merra Relative Humidity & Longitudinal-Vertical Circulation
Longitudinal-vertical circulation and relative humidity in summer (July-August-September) (and their difference), all averaged over 5o N – 20o N.
Meridional-vertical circulation and relative humidity in summer (July-August-September) (and their difference), all averaged over 15o W – 10o E.
Merra Relative Humidity & Associated Meridional-Vertical Circulation
1999 2000 2001 2002
Merra Relative Humidity & Associated Longitudinal-Vertical Circulation
1999 2000 2001 2002
Longitudinal-vertical circulation and relative humidity in summer (July-August-September), all averaged over 5o N – 20o N.
Meridional-vertical circulation and relative humidity in summer (July-August-September), all averaged over 15o W – 10o E.
Merra Relative Humidity & Associated Meridional-Vertical Circulation
2003 2004 2005
Merra Relative Humidity & Associated Longitudinal-Vertical Circulation
2003 2004 2005
Meridional-vertical circulation and relative humidity in summer (July-August-September), all averaged over 15o W – 10o E.
Longitudinal-vertical circulation and relative humidity in summer (July-August-September), all averaged over 5o N – 20o N.
1999 (maximum precipitation) 2002 (minimum precipitation) Difference (1999 – 2002)
Era-Interim Relative Humidity & Meridional-Vertical Circulation
Era-Interim Relative Humidity & Longitudinal-Vertical Circulation
Longitudinal-vertical circulation and relative humidity in summer (July-August-September) (and their difference), all averaged over 5o N – 20o N.
Meridional-vertical circulation and relative humidity in summer (July-August-September) (and their difference), all averaged over 15o W – 10o E.
Era-Interim Relative Humidity & Associated Meridional-Vertical Circulation
1999 2000 2001 2002
Era-Interim Relative Humidity & Associated Longitudinal-Vertical Circulation
1999 2000 2001 2002
Longitudinal-vertical circulation and relative humidity in summer (July-August-September), all averaged over 5o N – 20o N, for 1000 hPa – 700 hPa
Meridional-vertical circulation and relative humidity in summer (July-August-September), all averaged over 15o W – 10o E.
Era-Interim Relative Humidity & Associated Meridional-Vertical Circulation
2003 2004 2005
Era-Interim Relative Humidity & Associated Longitudinal-Vertical Circulation
2003 2004 2005
Meridional-vertical circulation and relative humidity in summer (July-August-September), all averaged over 15o W – 10o E.
Longitudinal-vertical circulation and relative humidity in summer (July-August-September), all averaged over 5o N – 20o N, for 1000 hPa – 700 hPa
Merra Seasonal Cycle of Moisture Flux 1999 (maximum rainfall) 2000 (minimum rainfall) Difference (1999 – 2000)
Seasonal cycle of moisture flux (s-1) across 50 N (averaged over -150 W – 100 E), plotted as [v(dq/dy)] in row one, [q(dv/dy)] in row two, and [v(dq/dy) + q(dv/dy)] in row three.
Merra Seasonal Cycle of Moisture Flux 1999 (maximum rainfall) 2000 (minimum rainfall) Difference (1999 – 2000)
Seasonal cycle of moisture flux (s-1) (averaged over -150 W – 100 E), across the entire WAM in row one,Across the Sub-Sahel Area in row two, and across the Coastal Area in row three.
WAM:
Sub-Sahel:
Coastline:
Merra Seasonal Cycle of Moisture Flux
1999 (maximum rainfall) 2000 (minimum rainfall) Difference (1999 – 2000)
Seasonal cycle of moisture flux (s-1) across 50 N (averaged over -150 W – 100 E), plotted as v in row 1 and as q in row two.
Merra Seasonal Cycle of Moisture Flux
1999 (maximum rainfall) 2000 (minimum rainfall) Difference (1999 – 2000)
Seasonal cycle of moisture flux (s-1) across 50 N (averaged over -150 W – 100 E), plotted as dv/dy in row 1 and as dq/dy in row two.
Merra Seasonal Cycle of Moisture Flux 1999 2000 2001 2002
Seasonal cycle of moisture flux (s-1) across 50 N (averaged over -150 W – 100 E), plotted as [v(dq/dy)] in row one, [q(dv/dy)] in row two, and [v(dq/dy) + q(dv/dy)] in row three.
Merra Seasonal Cycle of Moisture Flux 2003 2004 2005
Seasonal cycle of moisture flux (s-1) across 50 N (averaged over -150 W – 100 E), plotted as [v(dq/dy)] in row one, [q(dv/dy)] in row two, and [v(dq/dy) + q(dv/dy)] in row three.
Era-Interim Seasonal Cycle of Moisture Convergence (g kg-1 day-1), averaged over the West African Monsoon Domain
Merra Seasonal Cycle of Moisture Convergence (g kg-1 day-1), averaged over the West African Monsoon Domain
Comparison of total moisture convergence cycles, and its components related to nonlatent and latent heating, respectively
plots in progress
Merra Seasonal Cycle of Moisture Convergence (g kg-1 day-1), averaged over the West African Monsoon Domain
non-latent heat adjusted for precipitation:
Merra Seasonal Cycle of Moisture Convergence (g kg-1 day-1), averaged over the West African Monsoon Domain
Comparison of total moisture convergence cycles, and its components related to nonlatent and latent heating, respectively
Merra Seasonal Cycle of Moisture Convergence (g kg-1 day-1), averaged over the WAM for 1999 and 2000
non-latent heat adjusted for precipitation:
Merra Seasonal Cycle of Moisture Convergence (g kg-1 day-1),) averaged over the WAM for 1999 and 2000
Comparison of 1999 (maximum precipitation) and 2000 (minimum precipitation) total moisture convergence cycles, and its components related to nonlatent and latent heating, respectively
Merra Seasonal Cycle of Moisture Convergence 1999 (maximum rainfall) 2000 (minimum rainfall) Difference (1999 – 2000)
Seasonal cycle of moisture convergence (g kg-1 day-1) averaged over 1000 hPa – 700 hPa in the WAM by total, nonlatent heat-divergent, and latent heat-divergent winds (and the difference). The contours represent associated precipitation values (mm/day).
Merra Seasonal Cycle of Moisture Convergence
1999 2000 2001 2002
Seasonal cycle of moisture convergence (g kg-1 day-1) averaged over 1000 hPa – 700 hPa in the WAM by total, nonlatent heat-divergent, and latent heat-divergent winds. The contours represent associated precipitation values (mm/day).
Merra Seasonal Cycle of Moisture Convergence
2003 2004 2005
Seasonal cycle of moisture convergence (g kg-1 day-1) averaged over 1000 hPa – 700 hPa in the WAM by total, nonlatent heat-divergent, and latent heat-divergent winds. The contours represent associated precipitation values (mm/day).
Era-Interim Seasonal Cycle of Moisture Convergence 1999 (maximum rainfall) 2002 (minimum rainfall) Difference (1999 – 2000)
Seasonal cycle of moisture convergence (g kg-1 day-1) averaged over 1000 hPa – 700 hPa in the WAM by total, nonlatent heat-divergent, and latent heat-divergent winds (and the difference). The contours represent associated precipitation values (mm/day).
Era-Interim Seasonal Cycle of Moisture Convergence 1999 (maximum rainfall) 2000 2001
Seasonal cycle of moisture convergence (g kg-1 day-1) averaged over 1000 hPa – 700 hPa in the WAM by total, nonlatent heat-divergent, and latent heat-divergent winds (and the difference). The contours represent associated precipitation values (mm/day).
2002 (minimum rainfall) 2003 2004 2005
Merra Meridional-Vertical Circulation
1999 (maximum precipitation) 2000 (minimum precipitation) (1999-2000)
Meridional-vertical circulation, its divergent and non-divergent components, and their moisture convergence in summer (July-August-September), all averaged over 15o W – 10o E. Column 3 represents the difference between 1999 and 2000 values (the years
of maximum and minimum precipitation, respectively). The solid line marks the coast line.
Merra Meridional-Vertical Circulation 1999 (maximum precipitation) 2000 (minimum precipitation) (1999-2000)
As above, for pressure levels 1000 hPa – 700 hPa
Merra Meridional-Vertical Circulation
1999 (maximum precipitation) 2000 (minimum precipitation) (1999-2000)
Divergent meridional-vertical circulation, its nonlatent and latent heating components, and their moisture convergence in summer (July-August-September), all averaged over 15o W – 10o E. Column 3 represents the difference between 1999 and 2000 values (the
years of maximum and minimum precipitation, respectively). The solid line marks the coast line.
Merra Meridional-Vertical Circulation 1999 (maximum precipitation) 2000 (minimum precipitation) (1999-2000)
As above, for pressure levels 700 hPa – 1000 hPa
Merra Longitudinal-Vertical Circulation
1999 (maximum precipitation) 2000 (minimum precipitation) (1999 – 2000)
Longitudinal-veritcal circulation, its divergent and non-divergent components, and their moisture convergence in summer (July-August-September), all averaged over 15o W – 10o E. Column three represents the difference between 1999 and 2000 values (the
years of maximum and minimum precipitation, respectively).
Merra Longitudinal-Vertical Circulation 1999 (maximum precipitation) 2000 (minimum precipitation) (1999 – 2000)
As above, for pressure levels 700 hPa – 1000 hPa
Divergent longitudinal-vertical circulation, its nonlatent and latent heating components, and their moisture convergence in summer (July-August-September), all averaged over 15o W – 10o E. Column three represents the difference between 1999 and 2000
values (the years of maximum and minimum precipitation, respectively).
Merra Longitudinal-Vertical Circulation
1999 (maximum precipitation) 2000 (minimum precipitation) (1999 – 2000)
As above, for pressure levels 700 hPa – 1000 hPa
Merra Longitudinal-Vertical Circulation 1999 (maximum precipitation) 2000 (minimum precipitation) (1999 – 2000)
Merra Spring Nonlatent-Heating vs. Summer Latent-Heating
Summer (July-August-September) latent heating plotted against spring (April-May-June) nonlatent heating over the WAM
April May June
July, August, and September latent heating plotted against April, May, and June nonlatent-heating, respectively, over the WAM
Merra Spring Nonlatent-Heating vs. Summer Precipitation
Summer (July-August-September) latent heating plotted against spring (April-May-June) precipitation over the WAM
April May June
July, August, and September precipitation plotted against April, May, and June nonlatent-heating, respectively, over the WAM
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