Answer:
a meteorologist with knowledge of oceanography
Explanation:
A meteorologist is someone who has the understanding of the earth's atmosphere and can predict the chemical and physical changes in the atmosphere. They are often involved in weather forecasting and conduct the related research. On the other hand, oceanography is investigation of the earth's oceans both physically and biologically. Climate change is known to effect the planet's weather or atmosphere and has effected the oceans. Therefore, a meteorologist with knowledge of oceanography can provide the most complete analysis to a congressman who wanted an informed analysis of the problem.