diff --git a/GPUSimulators/common/arrays/hip/arkawa2d.py b/GPUSimulators/common/arrays/hip/arkawa2d.py
index 67aaf6c..f1e53c2 100644
--- a/GPUSimulators/common/arrays/hip/arkawa2d.py
+++ b/GPUSimulators/common/arrays/hip/arkawa2d.py
@@ -1,4 +1,5 @@
 import ctypes
+from typing import Union
 
 import numpy as np
 from hip import hip, hipblas
@@ -13,12 +14,28 @@ class HIPArakawaA2D(BaseArakawaA2D):
     A class representing an Arakawa A type (unstaggered, logically Cartesian) grid
     """
 
-    def __init__(self, stream, nx, ny, halo_x, halo_y, cpu_variables):
+    def __init__(self, stream: hip.ihipStream_t, nx: int, ny: int, halo_x: int, halo_y: int, cpu_variables: list[Union[np.ndarray, None]]):
         """
         Uploads initial data to the GPU device
         """
         super().__init__(stream, nx, ny, halo_x, halo_y, cpu_variables, HIPArray2D)
 
+        # Variables for ``__sum_array``
+        # TODO should have a way of not hardcoding the dtype
+        dtype = np.float32
+        self.__result_h = np.zeros(1, dtype=dtype)
+        self.__num_bytes = self.__result_h.itemsize
+        self.__result_d = hip_check(hip.hipMalloc(self.__num_bytes))
+        self.__total_sum_d = hip_check(hip.hipMalloc(self.__num_bytes))
+
+        self.__handle = hip_check(hipblas.hipblasCreate())
+
+    def __del__(self):
+        # Cleanup GPU variables in ``__sum_array``
+        hip_check(hipblas.hipblasDestroy(self.__handle))
+        hip_check(hip.hipFree(self.__result_d))
+        hip_check(hip.hipFree(self.__total_sum_d))
+
     def check(self):
         """
         Checks that data is still sane
@@ -31,8 +48,7 @@ class HIPArakawaA2D(BaseArakawaA2D):
             if np.isnan(var_sum):
                 raise ValueError("Data contains NaN values!")
 
-    @staticmethod
-    def __sum_array(array: HIPArray2D) -> np.ndarray[tuple[int]]:
+    def __sum_array(self, array: HIPArray2D) -> np.ndarray[tuple[int]]:
         """
         Sum all the elements in HIPArray2D using hipblas.
         Args:
@@ -40,35 +56,22 @@ class HIPArakawaA2D(BaseArakawaA2D):
         Returns:
             The sum of all the elements in ``array``.
         """
-        dtype = array.dtype
-        result_h = np.zeros(1, dtype=dtype)
-        num_bytes = dtype.itemsize
-        result_d = hip_check(hip.hipMalloc(num_bytes))
-
-        # Sum the ``data_h`` array using hipblas
-        handle = hip_check(hipblas.hipblasCreate())
 
         # Using pitched memory, so we need to sum row by row
-        total_sum_d = hip_check(hip.hipMalloc(num_bytes))
-        hip_check(hip.hipMemset(total_sum_d, 0, num_bytes))
+        hip_check(hip.hipMemset(self.__total_sum_d, 0, self.__num_bytes))
 
         width, height = array.shape
 
         for y in range(height):
             row_ptr = int(array.data) + y * array.pitch_d
 
-            hip_check(hipblas.hipblasSasum(handle, width, row_ptr, 1, result_d))
+            hip_check(hipblas.hipblasSasum(self.__handle, width, row_ptr, 1, self.__result_d))
 
-            hip_check(hipblas.hipblasSaxpy(handle, 1, ctypes.c_float(1.0), result_d, 1, total_sum_d, 1))
-
-            hip_check(hip.hipMemcpy(result_h, total_sum_d, num_bytes, hip.hipMemcpyKind.hipMemcpyDeviceToHost))
+            hip_check(
+                hipblas.hipblasSaxpy(self.__handle, 1, ctypes.c_float(1.0), self.__result_d, 1, self.__total_sum_d, 1))
 
         # Copy over the result from the device
-        hip_check(hip.hipMemcpy(result_h, total_sum_d, num_bytes, hip.hipMemcpyKind.hipMemcpyDeviceToHost))
+        hip_check(hip.hipMemcpy(self.__result_h, self.__total_sum_d, self.__num_bytes,
+                                hip.hipMemcpyKind.hipMemcpyDeviceToHost))
 
-        # Cleanup
-        hip_check(hipblas.hipblasDestroy(handle))
-        hip_check(hip.hipFree(result_d))
-        hip_check(hip.hipFree(total_sum_d))
-
-        return result_h
+        return self.__result_h