The relationship between the Sahelian and previous 2nd Guinean rainy seasons: a monsoon regulation by soil wetness?
The correlation of 0.61 found between observed July–September Sahelian rainfall in year 0 and September–November Guinean rainfall in year - 1, led us to explore the statistical relationships between precipitation, soil moisture and near surface Moist Static Energy (MSE) gradients in West Afr...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2002-04-01
|
| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/20/575/2002/angeo-20-575-2002.pdf |
| _version_ | 1818390939906867200 |
|---|---|
| author | N. Philippon N. Philippon N. Philippon B. Fontaine |
| author_facet | N. Philippon N. Philippon N. Philippon B. Fontaine |
| author_sort | N. Philippon |
| collection | DOAJ |
| description | The correlation of 0.61
found between observed July–September Sahelian rainfall in year 0 and
September–November Guinean rainfall in year - 1, led us to explore the
statistical relationships between precipitation, soil moisture and near surface
Moist Static Energy (MSE) gradients in West Africa. These analyses were
performed over successive 30-year periods and specifically, the most recent
period between 1968–1998. It is shown from observations, National Centers for
Environmental Predictions and National Center for Atmospheric Research (NCEP/NCAR)
reanalyses and from the Global Soil Wetness Project (GSWP) database, that wet
Sahelian rainy seasons are preceded by abnormally wet soils over the
Sudan-Guinean belt during northern winter. Such moisture anomalies tend to hold
during the dry season, then generate increasing MSE gradients just above the
continent by March–April. These gradients have been shown to be of prime
importance for monsoon dynamics and associated rainfall.<br><br><b>Key words. </b>Hydrology (soil
moisture) – Meteorology and atmospheric dynamics (climatology) |
| first_indexed | 2024-12-14T05:05:36Z |
| format | Article |
| id | doaj.art-22411cbd7710464aa11d7a9aa498483f |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-14T05:05:36Z |
| publishDate | 2002-04-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-22411cbd7710464aa11d7a9aa498483f2022-12-21T23:16:07ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762002-04-012057558210.5194/angeo-20-575-2002The relationship between the Sahelian and previous 2nd Guinean rainy seasons: a monsoon regulation by soil wetness?N. Philippon0N. Philippon1N. Philippon2B. Fontaine3Correspondence to: N. PhilipponCentre de Recherches de Climatologie, UMR 5080 CNRS, Université de Bourgogne, 6 blvd. Gabriel, BP 138, 21000 Dijon, France(nphilipp@u-bourgogne.fr)Centre de Recherches de Climatologie, UMR 5080 CNRS, Université de Bourgogne, 6 blvd. Gabriel, BP 138, 21000 Dijon, FranceThe correlation of 0.61 found between observed July–September Sahelian rainfall in year 0 and September–November Guinean rainfall in year - 1, led us to explore the statistical relationships between precipitation, soil moisture and near surface Moist Static Energy (MSE) gradients in West Africa. These analyses were performed over successive 30-year periods and specifically, the most recent period between 1968–1998. It is shown from observations, National Centers for Environmental Predictions and National Center for Atmospheric Research (NCEP/NCAR) reanalyses and from the Global Soil Wetness Project (GSWP) database, that wet Sahelian rainy seasons are preceded by abnormally wet soils over the Sudan-Guinean belt during northern winter. Such moisture anomalies tend to hold during the dry season, then generate increasing MSE gradients just above the continent by March–April. These gradients have been shown to be of prime importance for monsoon dynamics and associated rainfall.<br><br><b>Key words. </b>Hydrology (soil moisture) – Meteorology and atmospheric dynamics (climatology)https://www.ann-geophys.net/20/575/2002/angeo-20-575-2002.pdf |
| spellingShingle | N. Philippon N. Philippon N. Philippon B. Fontaine The relationship between the Sahelian and previous 2nd Guinean rainy seasons: a monsoon regulation by soil wetness? Annales Geophysicae |
| title | The relationship between the Sahelian and previous 2nd Guinean rainy seasons: a monsoon regulation by soil wetness? |
| title_full | The relationship between the Sahelian and previous 2nd Guinean rainy seasons: a monsoon regulation by soil wetness? |
| title_fullStr | The relationship between the Sahelian and previous 2nd Guinean rainy seasons: a monsoon regulation by soil wetness? |
| title_full_unstemmed | The relationship between the Sahelian and previous 2nd Guinean rainy seasons: a monsoon regulation by soil wetness? |
| title_short | The relationship between the Sahelian and previous 2nd Guinean rainy seasons: a monsoon regulation by soil wetness? |
| title_sort | relationship between the sahelian and previous 2nd guinean rainy seasons a monsoon regulation by soil wetness |
| url | https://www.ann-geophys.net/20/575/2002/angeo-20-575-2002.pdf |
| work_keys_str_mv | AT nphilippon therelationshipbetweenthesahelianandprevious2ndguineanrainyseasonsamonsoonregulationbysoilwetness AT nphilippon therelationshipbetweenthesahelianandprevious2ndguineanrainyseasonsamonsoonregulationbysoilwetness AT nphilippon therelationshipbetweenthesahelianandprevious2ndguineanrainyseasonsamonsoonregulationbysoilwetness AT bfontaine therelationshipbetweenthesahelianandprevious2ndguineanrainyseasonsamonsoonregulationbysoilwetness AT nphilippon relationshipbetweenthesahelianandprevious2ndguineanrainyseasonsamonsoonregulationbysoilwetness AT nphilippon relationshipbetweenthesahelianandprevious2ndguineanrainyseasonsamonsoonregulationbysoilwetness AT nphilippon relationshipbetweenthesahelianandprevious2ndguineanrainyseasonsamonsoonregulationbysoilwetness AT bfontaine relationshipbetweenthesahelianandprevious2ndguineanrainyseasonsamonsoonregulationbysoilwetness |