Coastal Marine Heatwaves (MHWs) in the South West Tropical Pacific (SWTP) - (1993-2023)

This dataset contains information on all coastal MHWs for 12 Pacific Island Countries and Territories (PICTs) in the SWTP. MHW detection was done to understand the nature of these extreme temperature events along the coastlines of these PICTs and characterise them in terms of their properties including duration, maximum and cumulative intensities and onset and decline rates. Means and trends of these properties were explored as well. (Visit https://github.com/shilpa-s-lal/mhws for MHW analysis scripts.) MHWs were detected using the Hobday et al.(2016) method with a 90th percentile threshold and using OSTIA temperature product for the period 1993 to 2023 with the 1993 to 2019 period used as a baseline. The 12 PICTs are as follows: New Caledonia labelled as "newcal" in the filenames. Solomon Islands labelled as "solo" in the filenames. Vanuatu Fiji Tonga Wallis and Futuna labelled as "wf" in the filenames. Samoa American Samoa labelled as "amsam" in the filenames. Niue Tokelau Tuvalu Cook Islands labelled as "cooks" in the filenames. Files with filename "{country_name}_coastalpoints.csv"provides information on all points along the coastlines of the 12 PICTs where MHW detection was conducted. Files with filename "combined_mhw_output_{country_name}.csv"contains information on the properties of each MHW at each coastal point. Refer to Marine heatwaves package documents developed by Eric Oliver to understand the calculation of each MHW property (https://github.com/ecjoliver/marineHeatWaves). Files with filename "{country_name}.csv" contains trends, means and standard deviation of MHW properties at each coastal point. In summary, the main output of the "combined_mhw_output_{country_name}.csv" files are: country - country of coastal MHW detection latitude,longitude - location of coastal point index_start,index_end,index_peak - timestep when MHW started, ended and peaked date_start,date_end,date_peak - date of MHW start, end and peak duration - duration of each MHW event (days) intensity_max,intensity_mean,intensity_cumulative - maximum intensity (deg. C), mean intensity (deg. C) and cummulative intensity (deg. C x days) of each MHW category - measure of severity of event rateonset,ratedecline - onset and decline rate of MHW event (deg. C / days) reaction_window_days,coping_window_days - days from start of event to peak of MHW event and days from peak of MHW event to end of the event. In summary, the main output of the "{country_name}.csv" files are: country - country of coastal MHW detection latitude,longitude - location of coastal point mean_duration,std_duration - mean and standard deviation of MHW duration at that coastal point mean_intensity_mean,std_intensity_mean - mean and standard deviation of MHW intensity mean at that coastal point mean_intensity_var,std_intensity_var - mean and standard deviation of MHW intensity variability at that coastal point mean_intensity_max,std_intensity_max - mean and standard deviation of MHW intensity max at that coastal point mean_intensity_cumulative,std_intensity_cumulative - mean and standard deviation of MHW intensity cumulative at that coastal point mean_rate_onset,std_rate_onset - mean and standard deviation of MHW rate onset at that coastal point mean_rate_decline,std_rate_decline - mean and standard deviation of MHW rate decline at that coastal point mean_total_days,std_total_days - mean and standard deviation of MHW days each year. mean_total_icum,std_total_icum - mean and standard deviation of total cumulative intensity of all events each year. sig_trend_per_decade_count - significance and trend of number of events per year sig_trend_per_decade_duration - significance and trend of mHW duration per year sig_trend_per_decade_intensity_max - significance and trend of MHW intensity max per year sig_trend_per_decade_intensity_max_max - significance and trend of MHW max intensity max per year sig_trend_per_decade_intensity_mean - significnace and trend of MHW intensity mean per year sig_trend_per_decade_intensity_var - significance and trend of MHW intensity variability per year sig_trend_per_decade_intensity_cumulative - significance and trend of MHW intensity cumulative per year. sig_trend_per_decade_rate_onset - significance and trend of MHW onset rate per year sig_trend_per_decade_rate_decline - significance and trend of MHW decline rate per year sig_trend_per_decade_total_days - significance and trend of MHW days per year sig_trend_per_decade_total_icum - significance and trend of total cumulative intensity per year sum_total_days,sum_total_icum - sum no. of MHW days and sum cumulative intensity number_of_events - sum number of MHW events count_trend_per_decade - number of events per decade duration_trend_per_decade - MHW duration per decade intensity_max_trend_per_decade - MHW intensity max per decade intensity_max_max_trend_per_decade - max MHW intensity max per decade intensity_mean_trend_per_decade - MHW intensity mean per decade intensity_var_trend_per_decade - MHW intensity variability per decade intensity_cumulative_trend_per_decade - MHW intensity cumulative per decade rate_onset_trend_per_decade - MHW rate onset per decade rate_decline_trend_per_decade - MHW rate decline per decade total_days_trend_per_decade - MHW days per decade total_icum_trend_per_decade - MHW cumulative intensity per decade count_mean_per_year - mean number of MHW events per year duration_mean_per_year - mean MHW duration per year intensity_mean_mean_per_year - mean intensity mean per year intensity_max_max_mean_per_year - mean maximum intensity max per year intensity_var_mean_per_year - mean intensity variability per year intensity_cumulative_mean_per_year - mean intensity cumulative per year rate_onset_mean_per_year - mean rate onset per year rate_decline_mean_per_year - mean rate decline per year total_days_mean_per_year - mean sum MHW days per year total_icum_mean_per_year - mean sum intensity cumulative per year