(b) Using the schematic below, the above equation can be used to illustrate the development of a sea breeze between cold ocean and warm land. The average temperature of the air column over the ocean is \( \bar{T}_{1} \), and over the land is \( \bar{T}_{2}\left(\bar{T}_{2}>\bar{T}_{1}\right) \). Taking the (nearly) horizontal segments of the circuit as lines of constant pressure (with \( p_{0} \) assumed to be parallel to the surface and \( h \) assumed constant), integrate the righthand side term in the equation for the rate of change of \( C \) along the closed circuit (solid black closed line with arrows in the figure). What sign does \( \frac{d C}{d t} \) have?