Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JCLI-D-19-0352.1 |
Using Self-Organizing Maps to Identify Coherent CONUS Precipitation Regions | |
Swenson, Leif M.; Grotjahn, Richard | |
2019-11-01 | |
发表期刊 | JOURNAL OF CLIMATE
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ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2019 |
卷号 | 32期号:22页码:7747-7761 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Extreme precipitation events have major societal impacts. These events are rare and can have small spatial scale, making statistical analysis difficult; both factors are mitigated by combining events over a region. A methodology is presented to objectively define "coherent" regions wherein data points have matching annual cycles. Regions are found by training self-organizing maps (SOMs) on the annual cycle of precipitation for each grid point across the contiguous United States (CONUS). Using the annual cycle for our intended application minimizes problems caused by consecutive dry periods and localized extreme events. Multiple criteria are applied to identify useful numbers of regions for our future application. Criteria assess these properties for each region: having many more events than experienced by a single grid point, good connectedness and compactness, and robustness to changing the number of regions. Our methodology is applicable across datasets and is tested here on both reanalysis and gridded observational data. Precipitation regions obtained align with large-scale geographical features and are readily interpretable. Useful numbers of regions balance two conflicting preferences: larger regions contain more events and thereby have more robust statistics, but more compact regions allow weather patterns associated with extreme events to be aggregated with confidence. For 6-h precipitation, 12-15 regions over the CONUS optimize our metrics. The regions obtained are compared against two existing region archetypes. For example, a popular set of regions, based on nine groups of states, has less coherent regions than defining the same number of regions with our SOM methodology. |
英文关键词 | Atmosphere North America Precipitation Climate classification regimes Climatology Neural networks |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000490757700002 |
WOS关键词 | EVENTS |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/188121 |
专题 | 气候变化 |
作者单位 | Univ Calif Davis, Dept Land Air & Water Resources, Davis, CA 95616 USA |
推荐引用方式 GB/T 7714 | Swenson, Leif M.,Grotjahn, Richard. Using Self-Organizing Maps to Identify Coherent CONUS Precipitation Regions[J]. JOURNAL OF CLIMATE,2019,32(22):7747-7761. |
APA | Swenson, Leif M.,&Grotjahn, Richard.(2019).Using Self-Organizing Maps to Identify Coherent CONUS Precipitation Regions.JOURNAL OF CLIMATE,32(22),7747-7761. |
MLA | Swenson, Leif M.,et al."Using Self-Organizing Maps to Identify Coherent CONUS Precipitation Regions".JOURNAL OF CLIMATE 32.22(2019):7747-7761. |
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