Accumulated cyclone energy (ACE) is a metric used to compare overall activity of tropical cyclones, utilizing the available records of windspeeds at six-hour intervals to synthesize storm duration and strength into a single index value. [2] The ACE index may refer to a single storm or to groups of storms such as those within a particular month ...

1 天前 · Tropical cyclone accumulated cyclone energy (ACE) has exhibited strikingly large global interannual variability during the past 40-years. In the pentad since 2006, Northern Hemisphere and global tropical cyclone ACE has decreased dramatically to …

2019年5月22日 · The ACE index is a wind energy index, defined as the sum of the squares of the maximum sustained surface wind speed (knots) measured every six hours for all named storms while they are at least tropical storm intensity. The 1991-2020 mean value of the ACE index is 122.1 x 10 4 kt 2, and the median value is 125.5 x 10 4 kt 2. With most of 1991 ...

2025年3月5日 · What is Accumulated Cyclone Energy (ACE)? How it's used to measure tropical activity. Dr. William Gray of Colorado State University developed the Accumulated Cyclone Energy (ACE) index. An average year across the Atlantic basin produces an ACE value of 122.5.

ACE is calculated by using the formula ACE = 10-4Σv2 where v is the estimated sustained maximum wind speed measured in knots. This is calculated every six hours, typically at 0000, 0600,1200, and 1800 UTC.

2023年8月10日 · An important measure of the total seasonal activity is NOAA's Accumulated Cyclone Energy (ACE) index, which accounts for the combined intensity and duration of all named storms and hurricanes during the year. This 2023 outlook indicates a 70% chance that the seasonal ACE range will be 105-200% of the median.

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