May 20, 2024 · Intraseasonal oscillations and inter annual oscillations are predominantly changing the Arabian sea surface and sub-surface parameters especially in monsoon season. D26 layer and MLD are influencing the decrease of SST and diminishing the tropical cyclogenesis.

Mar 14, 2025 · The research team linked these D26 changes directly to the development of tropical cyclones, revealing that birth locations and initial intensities can shift based on the presence or absence of deeper, warmer ocean layers.

26°C isotherm (D26), also referred to as tropical cyclone heat potential (TCHP), has been shown to play a more impor-tant role in TC intensity changes (Shay et al., 2000). TCHP shows high spatial and temporal variability associated with oceanic mesoscale features. TC intensifi-cation has been linked with high values

much deeper subsurface layer is needed for slow-moving typhoons. For example at U h ~ 2-3 m s -1 , D26 and UOCH are typically ~ 115-140 m and ~ 115-125 kj cm -2 , respectively.

Mar 18, 2021 · The barrier layer (BL) is a layer of water separating the thermocline from the density mixed layer in the upper ocean, which has the capability of reducing the negative feedback effect caused by tropical cyclone (TC) acting on …

Feb 1, 2014 · In addition to the presently used two isotherms for the depths of 20 °C and 26 °C isotherms (D20 and D26), we derive continuous isotherms from D4 up to D29 (maximum 26 subsurface layers) to characterize the subsurface ocean thermal structure in detail.

Sep 3, 2013 · Ocean mixed layer process plays a critical role in modulating inner-core SSTs when D26 is deep, reducing mixed layer cooling and lowering the center pressure of the Katrina.

Monthly mean isotherm depths of the 20°C (D20) and 26°C (D26) (and their mean ratios), reduced gravities, and mixed layer depth (MLD) were estimated for both GDEM and WOA climatologies. Daily fields were created by applying a 15-day running average to the monthly fields to eliminate discontinuities when transitioning between months.

The Depth of the 26° isotherm in the ocean is represented as D26. It is obtained by scanning the ocean temperature profile from the surface to the depth where temperature reaches 26° C. It gives an idea of the depth to which the warm surface layer of the ocean extends.

The present work utilizes a modified one-dimensional (1-D) ocean mixed layer model to predict D26 and TCHP 48 hours in advance at an interval of every six hours. The model is forced with forecast surface meteorological parameters obtained from an …