Seasonal and Diurnal Variability in Near‐Surface Air and Ground Temperature Regimes of the Alpine Zone of Mount Kenya
Abstract Mountains near the equator have very unique temperature regimes due to the tropical latitude and alpine altitude. How climate change will impact these temperature regimes is not clear as there are so few temperature records in these environments. This study attempts to characterize the near...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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American Geophysical Union (AGU)
2024-02-01
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| Series: | Earth and Space Science |
| Subjects: | |
| Online Access: | https://doi.org/10.1029/2023EA003410 |
| _version_ | 1797290134450733056 |
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| author | Timothy A. Downing Daniel O. Olago Tobias Nyumba |
| author_facet | Timothy A. Downing Daniel O. Olago Tobias Nyumba |
| author_sort | Timothy A. Downing |
| collection | DOAJ |
| description | Abstract Mountains near the equator have very unique temperature regimes due to the tropical latitude and alpine altitude. How climate change will impact these temperature regimes is not clear as there are so few temperature records in these environments. This study attempts to characterize the near‐surface air and ground temperature regime for the Teleki Valley (3,200–4,200 m. a.s.l) on the western slope of Mount Kenya using a set of six temperature loggers placed at 200 m elevation intervals. Temperature was recorded at 30 min intervals from September 2021 to October 2022. The mean diurnal temperature range varied from 6°C to 14°C, with maximum daily swings in excess of 25°C. There was a distinct seasonality in temperature, with a hot season during the months of January‐March, where it was roughly 3°C warmer than the coolest months. Diurnal temperature swings were also highest in March. This seasonality is driven by radiation and moisture: higher radiation during the vernal equinox combined with clear skies during the dry season made for higher temperatures. Elevation was the dominant spatial gradient determining temperature regimes, but rock and vegetation cover played a large role in modifying near‐surface air and ground temperature. The highest elevation logger (4,200 m. a.s.l), measuring ground temperature, showed muted seasonal and diurnal swings, creating for warmer temperatures than lower elevation loggers. This demonstrates the importance of thermal refugia at these high elevations. This also makes predictions of plant and animal responses to climate change difficult, as uniform upward shifts would not necessarily maintain thermal niches. |
| first_indexed | 2024-03-07T19:16:03Z |
| format | Article |
| id | doaj.art-6071276fcd144b9d929aa3a4e7943c46 |
| institution | Directory Open Access Journal |
| issn | 2333-5084 |
| language | English |
| last_indexed | 2024-03-07T19:16:03Z |
| publishDate | 2024-02-01 |
| publisher | American Geophysical Union (AGU) |
| record_format | Article |
| series | Earth and Space Science |
| spelling | doaj.art-6071276fcd144b9d929aa3a4e7943c462024-02-29T13:15:57ZengAmerican Geophysical Union (AGU)Earth and Space Science2333-50842024-02-01112n/an/a10.1029/2023EA003410Seasonal and Diurnal Variability in Near‐Surface Air and Ground Temperature Regimes of the Alpine Zone of Mount KenyaTimothy A. Downing0Daniel O. Olago1Tobias Nyumba2Department of Earth and Climate Sciences University of Nairobi Nairobi KenyaDepartment of Earth and Climate Sciences University of Nairobi Nairobi KenyaDepartment of Environment and Geography University of York York UKAbstract Mountains near the equator have very unique temperature regimes due to the tropical latitude and alpine altitude. How climate change will impact these temperature regimes is not clear as there are so few temperature records in these environments. This study attempts to characterize the near‐surface air and ground temperature regime for the Teleki Valley (3,200–4,200 m. a.s.l) on the western slope of Mount Kenya using a set of six temperature loggers placed at 200 m elevation intervals. Temperature was recorded at 30 min intervals from September 2021 to October 2022. The mean diurnal temperature range varied from 6°C to 14°C, with maximum daily swings in excess of 25°C. There was a distinct seasonality in temperature, with a hot season during the months of January‐March, where it was roughly 3°C warmer than the coolest months. Diurnal temperature swings were also highest in March. This seasonality is driven by radiation and moisture: higher radiation during the vernal equinox combined with clear skies during the dry season made for higher temperatures. Elevation was the dominant spatial gradient determining temperature regimes, but rock and vegetation cover played a large role in modifying near‐surface air and ground temperature. The highest elevation logger (4,200 m. a.s.l), measuring ground temperature, showed muted seasonal and diurnal swings, creating for warmer temperatures than lower elevation loggers. This demonstrates the importance of thermal refugia at these high elevations. This also makes predictions of plant and animal responses to climate change difficult, as uniform upward shifts would not necessarily maintain thermal niches.https://doi.org/10.1029/2023EA003410temperature regimetropical alpinefrost daysthermal nichelapse rate |
| spellingShingle | Timothy A. Downing Daniel O. Olago Tobias Nyumba Seasonal and Diurnal Variability in Near‐Surface Air and Ground Temperature Regimes of the Alpine Zone of Mount Kenya Earth and Space Science temperature regime tropical alpine frost days thermal niche lapse rate |
| title | Seasonal and Diurnal Variability in Near‐Surface Air and Ground Temperature Regimes of the Alpine Zone of Mount Kenya |
| title_full | Seasonal and Diurnal Variability in Near‐Surface Air and Ground Temperature Regimes of the Alpine Zone of Mount Kenya |
| title_fullStr | Seasonal and Diurnal Variability in Near‐Surface Air and Ground Temperature Regimes of the Alpine Zone of Mount Kenya |
| title_full_unstemmed | Seasonal and Diurnal Variability in Near‐Surface Air and Ground Temperature Regimes of the Alpine Zone of Mount Kenya |
| title_short | Seasonal and Diurnal Variability in Near‐Surface Air and Ground Temperature Regimes of the Alpine Zone of Mount Kenya |
| title_sort | seasonal and diurnal variability in near surface air and ground temperature regimes of the alpine zone of mount kenya |
| topic | temperature regime tropical alpine frost days thermal niche lapse rate |
| url | https://doi.org/10.1029/2023EA003410 |
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