A Brief Assessment of the Impact of Nearly 40 Years of Assimilated Observations Over the Amazon Basin
Abstract Adding a Forecast Sensitivity‐based Observation Impact component to Version 2 of the Modern Era Retrospective‐analysis for Research and Applications, the present study provides an assessment of the impact of nearly 40 years of observations on short‐range (24‐hr) forecasts over the Amazon ba...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
American Geophysical Union (AGU)
2020-03-01
|
| Series: | Earth and Space Science |
| Subjects: | |
| Online Access: | https://doi.org/10.1029/2019EA000779 |
| _version_ | 1818364951452975104 |
|---|---|
| author | F. L. R. Diniz R. Todling D. L. Herdies |
| author_facet | F. L. R. Diniz R. Todling D. L. Herdies |
| author_sort | F. L. R. Diniz |
| collection | DOAJ |
| description | Abstract Adding a Forecast Sensitivity‐based Observation Impact component to Version 2 of the Modern Era Retrospective‐analysis for Research and Applications, the present study provides an assessment of the impact of nearly 40 years of observations on short‐range (24‐hr) forecasts over the Amazon basin. Under self‐verification, forecast errors are found to slightly increase from the early data‐sparse days to the more recent years, when data dramatically increase. Throughout the reanalysis, satellite radiances dominate in volume, but only before 1999 they dominate the impacts. Beyond 1999, over 50% of forecast error reduction is associated with conventional observations (radiosondes). Atmospheric Motion Vectors are also found to be large contributors to error reduction, but their contribution reduces in dry periods. In opposition to Atmospheric Motion Vectors, satellite radiances tend to contribute more in the dry season. Results provide motivation for additional conventional observations and the use of all‐sky treatment of radiances. |
| first_indexed | 2024-12-13T22:12:32Z |
| format | Article |
| id | doaj.art-e40b4f0155cd42d19d94f0fa3fb0f34a |
| institution | Directory Open Access Journal |
| issn | 2333-5084 |
| language | English |
| last_indexed | 2024-12-13T22:12:32Z |
| publishDate | 2020-03-01 |
| publisher | American Geophysical Union (AGU) |
| record_format | Article |
| series | Earth and Space Science |
| spelling | doaj.art-e40b4f0155cd42d19d94f0fa3fb0f34a2022-12-21T23:29:41ZengAmerican Geophysical Union (AGU)Earth and Space Science2333-50842020-03-0173n/an/a10.1029/2019EA000779A Brief Assessment of the Impact of Nearly 40 Years of Assimilated Observations Over the Amazon BasinF. L. R. Diniz0R. Todling1D. L. Herdies2INPE, Centro de Previsão de Tempo e Estudos Climáticos Cachoeira Paulista BrazilNASA, Global Modeling and Assimilation Office Greenbelt MD USAINPE, Centro de Previsão de Tempo e Estudos Climáticos Cachoeira Paulista BrazilAbstract Adding a Forecast Sensitivity‐based Observation Impact component to Version 2 of the Modern Era Retrospective‐analysis for Research and Applications, the present study provides an assessment of the impact of nearly 40 years of observations on short‐range (24‐hr) forecasts over the Amazon basin. Under self‐verification, forecast errors are found to slightly increase from the early data‐sparse days to the more recent years, when data dramatically increase. Throughout the reanalysis, satellite radiances dominate in volume, but only before 1999 they dominate the impacts. Beyond 1999, over 50% of forecast error reduction is associated with conventional observations (radiosondes). Atmospheric Motion Vectors are also found to be large contributors to error reduction, but their contribution reduces in dry periods. In opposition to Atmospheric Motion Vectors, satellite radiances tend to contribute more in the dry season. Results provide motivation for additional conventional observations and the use of all‐sky treatment of radiances.https://doi.org/10.1029/2019EA000779reanalysisforecast sensitivityobservation impactAmazon basin |
| spellingShingle | F. L. R. Diniz R. Todling D. L. Herdies A Brief Assessment of the Impact of Nearly 40 Years of Assimilated Observations Over the Amazon Basin Earth and Space Science reanalysis forecast sensitivity observation impact Amazon basin |
| title | A Brief Assessment of the Impact of Nearly 40 Years of Assimilated Observations Over the Amazon Basin |
| title_full | A Brief Assessment of the Impact of Nearly 40 Years of Assimilated Observations Over the Amazon Basin |
| title_fullStr | A Brief Assessment of the Impact of Nearly 40 Years of Assimilated Observations Over the Amazon Basin |
| title_full_unstemmed | A Brief Assessment of the Impact of Nearly 40 Years of Assimilated Observations Over the Amazon Basin |
| title_short | A Brief Assessment of the Impact of Nearly 40 Years of Assimilated Observations Over the Amazon Basin |
| title_sort | brief assessment of the impact of nearly 40 years of assimilated observations over the amazon basin |
| topic | reanalysis forecast sensitivity observation impact Amazon basin |
| url | https://doi.org/10.1029/2019EA000779 |
| work_keys_str_mv | AT flrdiniz abriefassessmentoftheimpactofnearly40yearsofassimilatedobservationsovertheamazonbasin AT rtodling abriefassessmentoftheimpactofnearly40yearsofassimilatedobservationsovertheamazonbasin AT dlherdies abriefassessmentoftheimpactofnearly40yearsofassimilatedobservationsovertheamazonbasin AT flrdiniz briefassessmentoftheimpactofnearly40yearsofassimilatedobservationsovertheamazonbasin AT rtodling briefassessmentoftheimpactofnearly40yearsofassimilatedobservationsovertheamazonbasin AT dlherdies briefassessmentoftheimpactofnearly40yearsofassimilatedobservationsovertheamazonbasin |