download ERA5 data for GSSHA domain

def _download(self):
        """download ERA5 data for GSSHA domain"""
        # reproject GSSHA grid and get bounds
        min_x, max_x, min_y, max_y = self.gssha_grid.bounds(as_geographic=True)
        if self.era_download_data == 'era5':
            log.info("Downloading ERA5 data ...")
            download_era5_for_gssha(self.lsm_input_folder_path,
                                    self.download_start_datetime,
                                    self.download_end_datetime,
                                    leftlon=min_x-0.5,
                                    rightlon=max_x+0.5,
                                    toplat=max_y+0.5,
                                    bottomlat=min_y-0.5)
        else:
            log.info("Downloading ERA Interim data ...")
            download_interim_for_gssha(self.lsm_input_folder_path,
                                       self.download_start_datetime,
                                       self.download_end_datetime,
                                       leftlon=min_x-1,
                                       rightlon=max_x+1,
                                       toplat=max_y+1,
                                       bottomlat=min_y-1)