Variability of the North Atlantic Subtropical High in the Year’s Wet Season and Its Relationship with the Tropical Cyclonic Activity †
Abstract
:1. Introduction
2. Materials and Methods
2.1. Selection of the Study Area
2.2. Data Collection in the Study Area
2.3. Data Processing
2.4. Information Processing
2.4.1. Time Series Trend Analysis
2.4.2. Principal Components Analysis
3. Results
3.1. Behavior of the Nash in the Period 1950–2019
3.1.1. Pressure of the NASH at Surface Level, Geopotential of the Anticyclonic Center at 850 hPa, and SHCI
3.1.2. Mean Monthly Position of the NASH at Surface Level and Position of the Anticyclonic Center at 850 hPa
3.1.3. Geopotential Height in the Central Region of the NASH at 500 hPa and 200 hPa
3.2. Relationship of the North Atlantic Subtropical High to Tropical Cyclone Originated in the Atlantic Ocean and the Caribbean Sea
4. Conclusions
- The North Atlantic Subtropical High, with an average central pressure of 1023.16 hPa and a mean value of SHCI of 1022.17 hPa, has experienced a slight shift to the north in latitude and to the west longitudinally with respect to its mean position, with a slight decrease in its central pressure and strength at the surface. The anticyclonic cell at 850 hPa, with an average geopotential height of 1587.24 mgP, showed a shift to the south in latitude and to the east in longitude. The middle and upper troposphere’s were characterized by a northward expansion of the subtropical high pressure belt with the consequent increase in geopotential height with KM=4.38 and KM=4.72 and an average geopotential of 5866.67 mgP and 12178.33 mgP, respectively.
- The low troposphere during the rainy period of the year continues to be a level that provides important elements in the prediction of tropical cyclogenesis in the North Atlantic basin, which is reaffirmed by [1,2,3], mainly the month of May in the entire study period and Juny and July months in the years after 2000 parameters like the pressure value, SHCI, and the position of the anticyclone on the surface and the high geopotential center at 850 hPa.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Parameters | KM | Alpha |
---|---|---|
Pressure of NASH | −1.43 | 0.15 |
SHCI | −1.67 | 0.09 |
Geopotential at 850 hPa | 2.20 | 0.02 |
DATA | Parameters | KM | Alpha |
---|---|---|---|
NASH | Latitude | 0.14 | 0.88 |
Longitude | 0.09 | 0.92 | |
Anticyclonic center at 850 hPa | Latitude | −1.61 | 0.11 |
Longitude | −0.92 | 0.35 |
Parameters | KM | Alpha |
---|---|---|
Geopotential height in the region of the NASH at 500 hPa | 4.38 | 0 |
Geopotential height in the region of the NASH at 200 hPa. | 4.72 | 0 |
1950–2019 Period | 2000–2019 Period | |||||
---|---|---|---|---|---|---|
Parameters | Factor 1 | Factor 2 | Factor 3 | Parameters | Factor 1 | Factor 2 |
At | 0.492174 | −0.636923 | 0.073758 | At | −0.760387 | −0.392238 |
SHCI (May) | 0.123590 | 0.448531 | 0.580723 | Lat (Jul) | −0.850983 | 0.247482 |
Lon8 (May) | 0.265898 | 0.388637 | 0.598651 | Lon (Jun) | −0.759703 | −0.358299 |
LonRid8 (Jul) | 0.158372 | 0.663428 | 0.320834 | Lon (Jul) | −0.850052 | 0.183750 |
LatRid8 (Jul) | 0.094338 | 0.423518 | −0.668403 | Lat8 (Jul) | −0.742565 | 0.402848 |
La5 (Jun) | −0.854525 | 0.267342 | 0.108354 | Lon8 (May) | 0.087394 | 0.936878 |
LaP (Jun) | −0.878148 | 0.203478 | 0.102277 | Lon8 (Jul) | −0.798835 | −0.307470 |
1950−2019 Period | 2000−2019 Period | ||||
---|---|---|---|---|---|
Parameters | Factor 1 | Factor 2 | Factor 3 | Parameters | Factor 1 |
Car | −0.473135 | −0.326093 | 0.195926 | Car | −0.760387 |
Prs (May) | 0.954604 | −0.224474 | −0.003035 | Lat (Jul) | −0.850983 |
SHCI (May) | 0.899088 | −0.213953 | 0.061957 | Lon (Jun) | 0.759703 |
Gth850 (May) | 0.819421 | −0.259142 | 0.231832 | Gth850 (Jun) | 0.850052 |
Lat8 (May) | 0.836651 | −0.114311 | −0.213328 | Lat8 (Jul) | −0.742565 |
Lat8 (Jul) | −0.309918 | −0.790566 | −0.271513 | Lon8 (Jun) | 0.087394 |
Lon8 (Jul) | −0.440305 | −0.528751 | −0.537345 | LonD8 (May) | −0.798835 |
La5 (Jun) | 0.021272 | −0.586060 | 0.395376 | ||
LaP (May) | −0.429450 | −0.221189 | 0.700308 |
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Rodríguez, Y.R.; Figueredo, N.V.; Peña, L.P. Variability of the North Atlantic Subtropical High in the Year’s Wet Season and Its Relationship with the Tropical Cyclonic Activity. Environ. Sci. Proc. 2023, 27, 27. https://doi.org/10.3390/ecas2023-15482
Rodríguez YR, Figueredo NV, Peña LP. Variability of the North Atlantic Subtropical High in the Year’s Wet Season and Its Relationship with the Tropical Cyclonic Activity. Environmental Sciences Proceedings. 2023; 27(1):27. https://doi.org/10.3390/ecas2023-15482
Chicago/Turabian StyleRodríguez, Yandy Rodríguez, Nathalí Valderá Figueredo, and Leticia Peña Peña. 2023. "Variability of the North Atlantic Subtropical High in the Year’s Wet Season and Its Relationship with the Tropical Cyclonic Activity" Environmental Sciences Proceedings 27, no. 1: 27. https://doi.org/10.3390/ecas2023-15482