Calculate the freezing point temperature of seawater from absolute salinity and pressure using GSW thermodynamic equations.
import asyncio
import json
from contextlib import AsyncExitStack
from mcp.client.streamable_http import streamablehttp_client
from mcp import ClientSession
class OceanClient:
"""OceanGSW-Tool MCP Client"""
def __init__(self, server_url: str, api_key: str):
self.server_url = server_url
self.api_key = api_key
self.session = None
async def connect(self):
try:
self.transport = streamablehttp_client(
url=self.server_url,
headers={"SCP-HUB-API-KEY": self.api_key}
)
self._stack = AsyncExitStack()
await self._stack.__aenter__()
self.read, self.write, self.get_session_id = await self._stack.enter_async_context(self.transport)
self.session_ctx = ClientSession(self.read, self.write)
self.session = await self._stack.enter_async_context(self.session_ctx)
await self.session.initialize()
return True
except Exception as e:
print(f"✗ connect failure: {e}")
return False
async def disconnect(self):
"""Disconnect from server"""
try:
if hasattr(self, '_stack'):
await self._stack.aclose()
print("✓ already disconnect")
except Exception as e:
print(f"✗ disconnect error: {e}")
def parse_result(self, result):
try:
if hasattr(result, 'content') and result.content:
content = result.content[0]
if hasattr(content, 'text'):
return json.loads(content.text)
return str(result)
except Exception as e:
return {"error": f"parse error: {e}", "raw": str(result)}
Calculate the freezing point of seawater based on salinity and pressure.
Workflow Steps:
Implementation:
## Initialize client
client = OceanClient(
"https://scp.intern-ai.org.cn/api/v1/mcp/34/OceanGSW-Tool",
"<your-api-key>"
)
if not await client.connect():
print("connection failed")
exit()
## Input parameters
input_params = {
'SP': [35.0, 5.0],
'p': [1000.0, 1000.0],
'lon': [120.0, 165.0],
'lat': [30.0, 45.0],
'saturation_fraction': [0.0, 0.0] # 0=air-free, 1=air-saturated
}
## Step 1: Calculate absolute salinity
result = await client.session.call_tool(
"gsw_example_absolute_salinity",
arguments={
"SP": input_params['SP'],
'p': input_params['p'],
'lon': input_params['lon'],
'lat': input_params['lat']
}
)
SA_result = client.parse_result(result)["st"]
## Step 2: Calculate freezing temperature
result = await client.session.call_tool(
"gsw_example_freezing_temp",
arguments={
"SA": SA_result,
"p": input_params['p'],
"saturation_fraction": input_params['saturation_fraction']
}
)
t_freeze_result = client.parse_result(result)["st"]["t_freeze"]
print("Freezing Temperature Results:")
for i, t_freeze in enumerate(t_freeze_result):
print(f"{i+1}. SA={SA_result[i]:.2f} g/kg, p={input_params['p'][i]} dbar")
print(f" Freezing temp: {t_freeze:.3f}°C\n")
await client.disconnect()
OceanGSW-Tool Server:
gsw_example_absolute_salinity: Convert practical to absolute salinitygsw_example_freezing_temp: Calculate freezing temperature
SA (list): Absolute salinity (g/kg)p (list): Pressure (dbar)saturation_fraction (list): Air saturation (0-1)Input:
SA: Absolute salinity (0-42 g/kg)p: Sea pressure (0-11000 dbar)saturation_fraction: 0 (air-free) to 1 (air-saturated)Output: