  This paper is concerned with the null controllability for linear backward
stochastic parabolic equations with dynamic boundary conditions and convection
terms. Using the classical duality argument, the null controllability is
obtained via an appropriate observability inequality of the corresponding
adjoint forward stochastic parabolic equation. To prove this observability
inequality, we develop a new global Carleman estimate for forward stochastic
parabolic equations that contains some first-order terms in the weak divergence
form. Our Carleman estimate is established by applying the duality technique.
Moreover, an estimate of the null-control cost is provided.
