Dynamical Constraint on Precipitation Biases Over the Indo‐Pacific Region During Boreal Summer in AMIP6 Models
Abstract Climate models suffer from longstanding precipitation biases, much of which has been attributed to their atmospheric component owing to unrealistic parameterizations. Here we investigate precipitation biases in 37 Atmospheric Model Intercomparison Project Phase 6 (AMIP6) models, focusing on...
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| Format: | Article |
| Language: | English |
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Wiley
2024-03-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2023GL107181 |
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| author | Honghai Zhang Shang‐Ping Xie Richard Seager Siyu Zhao |
| author_facet | Honghai Zhang Shang‐Ping Xie Richard Seager Siyu Zhao |
| author_sort | Honghai Zhang |
| collection | DOAJ |
| description | Abstract Climate models suffer from longstanding precipitation biases, much of which has been attributed to their atmospheric component owing to unrealistic parameterizations. Here we investigate precipitation biases in 37 Atmospheric Model Intercomparison Project Phase 6 (AMIP6) models, focusing on the Indo‐Pacific region during boreal summer. These models remain plagued by considerable precipitation biases, especially over regions of strong precipitation. In particular, 22 models overestimate the Asian‐Pacific monsoon precipitation, while 28 models underestimate the southern Indian Ocean Intertropical Convergence Zone precipitation. The inter‐model spread in summer precipitation is decomposed into Empirical Orthogonal Functions (EOFs). The leading EOF mode features an anomalous anticyclone circulation spanning the Indo‐northwest Pacific oceans, which we show is energized by barotropic conversion from the confluence of the background monsoonal westerlies and trade‐wind easterlies. Our results suggest precipitation biases in atmospheric models, though caused by unrealistic parameterizations, are organized by dynamical feedbacks of the mean flow. |
| format | Article |
| id | doaj-art-2b7e54782f3b47bf9c4cdf172ddbfb5e |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2024-03-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-2b7e54782f3b47bf9c4cdf172ddbfb5e2025-08-20T03:49:37ZengWileyGeophysical Research Letters0094-82761944-80072024-03-01516n/an/a10.1029/2023GL107181Dynamical Constraint on Precipitation Biases Over the Indo‐Pacific Region During Boreal Summer in AMIP6 ModelsHonghai Zhang0Shang‐Ping Xie1Richard Seager2Siyu Zhao3Department of Earth and Atmospheric Sciences University of Houston Houston TX USAScripps Institution of Oceanography University of California San Diego La Jolla CA USALamont Doherty Earth Observatory Columbia University Palisades NY USADepartment of Earth and Atmospheric Sciences University of Houston Houston TX USAAbstract Climate models suffer from longstanding precipitation biases, much of which has been attributed to their atmospheric component owing to unrealistic parameterizations. Here we investigate precipitation biases in 37 Atmospheric Model Intercomparison Project Phase 6 (AMIP6) models, focusing on the Indo‐Pacific region during boreal summer. These models remain plagued by considerable precipitation biases, especially over regions of strong precipitation. In particular, 22 models overestimate the Asian‐Pacific monsoon precipitation, while 28 models underestimate the southern Indian Ocean Intertropical Convergence Zone precipitation. The inter‐model spread in summer precipitation is decomposed into Empirical Orthogonal Functions (EOFs). The leading EOF mode features an anomalous anticyclone circulation spanning the Indo‐northwest Pacific oceans, which we show is energized by barotropic conversion from the confluence of the background monsoonal westerlies and trade‐wind easterlies. Our results suggest precipitation biases in atmospheric models, though caused by unrealistic parameterizations, are organized by dynamical feedbacks of the mean flow.https://doi.org/10.1029/2023GL107181precipitation biasAMIP6atmospheric circulationIndo‐PacificITCZmonsoon |
| spellingShingle | Honghai Zhang Shang‐Ping Xie Richard Seager Siyu Zhao Dynamical Constraint on Precipitation Biases Over the Indo‐Pacific Region During Boreal Summer in AMIP6 Models Geophysical Research Letters precipitation bias AMIP6 atmospheric circulation Indo‐Pacific ITCZ monsoon |
| title | Dynamical Constraint on Precipitation Biases Over the Indo‐Pacific Region During Boreal Summer in AMIP6 Models |
| title_full | Dynamical Constraint on Precipitation Biases Over the Indo‐Pacific Region During Boreal Summer in AMIP6 Models |
| title_fullStr | Dynamical Constraint on Precipitation Biases Over the Indo‐Pacific Region During Boreal Summer in AMIP6 Models |
| title_full_unstemmed | Dynamical Constraint on Precipitation Biases Over the Indo‐Pacific Region During Boreal Summer in AMIP6 Models |
| title_short | Dynamical Constraint on Precipitation Biases Over the Indo‐Pacific Region During Boreal Summer in AMIP6 Models |
| title_sort | dynamical constraint on precipitation biases over the indo pacific region during boreal summer in amip6 models |
| topic | precipitation bias AMIP6 atmospheric circulation Indo‐Pacific ITCZ monsoon |
| url | https://doi.org/10.1029/2023GL107181 |
| work_keys_str_mv | AT honghaizhang dynamicalconstraintonprecipitationbiasesovertheindopacificregionduringborealsummerinamip6models AT shangpingxie dynamicalconstraintonprecipitationbiasesovertheindopacificregionduringborealsummerinamip6models AT richardseager dynamicalconstraintonprecipitationbiasesovertheindopacificregionduringborealsummerinamip6models AT siyuzhao dynamicalconstraintonprecipitationbiasesovertheindopacificregionduringborealsummerinamip6models |